Hi There,

Are you looking to add in adsense code and position this within your posts?

If so then the plugin whydowork adsesne gives you a little of what you are after. You add the code and select where in the page you want the ads to appear etc...

If you are using WordPress take a look at the Free Hanna Code insert plug in. I use it for a lot of things.

For inserting Adsense I prefer Quick Adsense... can be used for all kinds of ads as well.

Watch out for plugins that cheat you out of your ad impressions.