Just wondering when it says in google adsense rules you can have 3 link units it also says 3 ad unites. does that mean a total of 3 or can i have 3 link units and 3 ad units on the same page? Also can i put 2 skyscraper right below one another so 2 banners in a row? thanks.
In my experience simple-looking pages perform the best (highest CTR), so be careful about cluttering things up with too many ad blocks (or anything else). I have a double digit CTR averaged across all my sites, and I never use more than a single ad block and a AdLinks unit (some sites have a search field as well). The best thing you can do, of course, is experiment. Just don't assume that more ads necessarily means more money.
Hammerfall - Interesting guidance. I struggle with AdSense on my blog and tend to fall into the trap of putting more ad units on the page out of frustration. I'm listening to your first podcast now - so far so good!