The Adsense Placement Thread ~ What works best?

I have read ebooks and been given heaps of advice on Adsense placement.
Let's get it all in one thread and find out what each of you think is best.

Col

 

Only one ad type on each page should help.

 

there is an official blog post about http://forums.megagames.com/ on adsense blog.

i think you must visit this site

 

I like an L shape approach where at some point the reader will cross and ad block. An example would be a leaderboard coupled with an ad unit underneath a post.