Now then I have 9 of my blogs having adsense ads and remaining having bidvertiser ads only 1 or two.
Anyway, you must be lucky to have Google adsense account. As you know recently Google is rejecting almost all applications for no reasons. Only professional webmasters now can apply for adsense. I wish I too applied for the account one or two years ago. Now it's not possible to have one. I can only go for bidvertiser.

BTW: I'm just curious to know how much you earn from your 9 blogs. I'm earning around $100 from posting in forums, so I'm not interested in blog stuffs, but if I come to know that we can earn more from blogs, then I'll stop concentrating on forums, and shift to blogging.