Thanks for the very valuable inputs, guys! I have to say "ouch" about not putting too much ads. I guess I have to redesign the layout of one of my blogs.
I also love the suggestion about rotating the ads. True, once the mind gets used to the position of one ad, it tends to skip it. But if there's a new ad there, then the location catches fresh attention.
Zagor, what's a "left float"? I think it's my first time to see this term
I understand the other terms you used.