I now use the "Mighty adsense" plugin (just goole it), It is much simpler (to me, anyway) than adsense deluxe. YMMV
i have on ad unit on the left sidebar, link on the right, an ad unit using the inbetween plugin, and a nice block on the single post -- works well for me. I play with the colors during the month to mix t up and it usually results in an increase if clicks.
Yeah, that's if they host your blog on wordpress.com. If you are using the Wordpress software on your own, then there are many ways to integrate Adsense.
I agree with the adsense deluxe plugin. It is easy to use and very easy to set up, although it had some issues with the previous version of WP but works fine with Ella -Alex www.wslounge.com