Here are the steps in a flash to grow your adsense monthly income:

1.Find a profitable Adsense niche.
2.Select the highest paying keywords.
3.Select the best SEO keywords.
4.Have the articles written and ask the writer to follow some very basic writing 5.rules so the articles are Adsense-ready AND SEO ready.
6.Create the site.
7.Submit the site to directories.
8.Publish articles for reprint on other sites to get tons of back links.
9.Add a few articles each month in order to grow your site with fresh content.
Start a new site!

AdSense-Deluxe WordPress Plugin
Updated for WordPress 2.0…
AdSense-Deluxe is an easy-to-use plugin for WordPress 1.5+ (including WP 2.0) for quickly inserting Google or Yahoo! ads into your blog posts, and managing when and where those ads are displayed. It was developed for my own use after an exhaustive search for a similar tool turned up nothing adequate.
Latest Version: 0.8 (released Jun 27, 2006 - Release Notes)
Download URL: Download AdSense-Deluxe Plugin
http://software.acmetech.com/wordpress/plugins/adsense-deluxe_wp_plugin.zip
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Adsense beautifier
plugin available for Wordpress to make your Adsense look beautiful in order to increase you Adsense earnings. Images adjacent to ads can help increase click through rate (CTR).Images can be use to increase our click through rate. You can add image next to your adsense to increase your Click Through Rate.Is it legal? Yes, but you have to add line to separate your image to adsense. Even google do this way to their new adsense format. You can see articles about these from:

http://www.supriyadisw.net/wp-content/uploads/adsenseBeautifier.zip
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Adsense Logger - a wordpress plugin
Just found a cool script at http://www.adsenselogger.com. This script counts your adsense impressions and clicks! It also shows you which colors are the good ones. It also collects data from adsense to report the earnings.
So all I did is to create a plugin for this script
This plugin installs the Adsense logger, inserts the corresponding javascript into the footer
and displays the reports within the admin interface. For statistics of your revenue, you have to
enter your adsense username and password in the configuration of adsense logger.
This adsense logger plugin uses the wordpress configured prefix for table creation for this logger.
http://kloeschen.com/wp-content/adsense_logger_0.2.2.zip
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WordPress Plugin: Adsense Inline
Adsense — in case you don’t know, is Google’s little advertising engine for non-Google sites. You know when you see Google ads on a site somewhere, and it says “Ads by Gooooogle” or somesuch? That’s it.

Google has some rules about how you place Adsense code on your site, though, and how many Adsense blocks can appear on a page (two?). I haven’t tried to accomodate these rules in this plugin yet. I probably will have to do that down the road. Caveat emptor.

The plugin [download] is pretty straightforward. Put it in your wp-content/plugins directory, then go to your Plugins configuration page and click Activate.

You’ll need to customize the Adsense code in the plugin itself. Look in the adsense.php file. In the first function there’s a block that says “Begin Google Adsense code”. You want to replace the lines between that line and the one that says “End Google Adsense code” with your actual adsense code provided to you by Google. Otherwise, you’ll be showing ads for me.
http://philhord.com/wp-hacks/adsense.zip
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I was looking for a simple simple Wordpress plugin that just inserted Adsense code randomly into a pre-existing blog. All the ones I found would only replace an Adsense comment with Adsense code. That’s great if you want to go through every article you have and post little adsense tags, but for a site that has some bulk to it, it sucks.

It also increased banner blindness by keeping the ads in the same place time after time.

http://wordpress-plugins.biggnuts.com/wp-content/code/adsense-injection-20.zip
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WordPress Plugin: AdRotator - Ad Rotating Solution for your Ads (including AdSense, Clicksor, Chitika etc.)
Displays an advertisement (which is randomly selected from a group of advertisements specified in a text file) at your chosen location. Tested on WordPress 1.5 & 2.x. Should work with earlier and later versions (future and past proofed). It can also be used with other CMS systems or anywhere where PHP is supported.

It does one job and does it well. Enough said.

http://blog.taragana.com/wp-content/upload/adrotator.zip
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WordPress Plugin: Target Adsense
Target Adsense is a plugin for WordPress that provides more control over how google_ad_section targeting is employed on your WordPress blog.

Section targeting allows you to suggest sections of your text and content that you’d like to emphasize or downplay when matching ads to your site’s content. This plugin helps you to emphasize the content you want by employing Google Ad Section Targeting. You may want to use targeting if you feel the Adsense ads on your pages could be more suited to the content. Ads that are more suited are more likely to get clicked on. It follows that profits may increase from using Ad targeting. For more information about targeting please read how to use Adsense Section Targeting to Maximize Profit.
http://www.maxpower.ca/?dl=adsense_target-B1.zip
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AdSense Sharing Revenue and Earnings System
AdSense Sharing Revenue and Earnings System is a wordpress plugin which allows you to view your adsense earnings and share your adsense impressions with your friends and co-authors.

http://adsense.ayanev.com/adsense-sharings.rar
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AdSense Widget
AdSense Widget by Mike Smullin.
Description: A Google AdSense widget for the new WordPress Sidebar Widgets plug-in. Requires Automattic’s Sidebar Widgets plug-in. Easy to install and requires no coding or template modification. Color, size and h2 title of your AdSense widget are all fully customizable from within the WordPress Presentations tab.
http://mikesmullin.com/freelance/wp-content/uploads/2006/04/wp-widgets-adsense.zip