Hey everyone, I've been doing a lot of reading and searching here lately about ad placements but I couldn't find any definitive threads on it. I did read a lot of people saying to experiment with ad placement so that's what I'm doing but I was also wondering...

I wanted to use the Google heat map, but my navigation is on the left so I was wondering if there were any OTHER heat maps out there that anyone knows about or if experimentation is really the best thing to do to figure out where to place my ads. Thx!