I have found that AdSense is the best of the bunch... but adbrite is a very close second in my opinion...
I have seen this topic on dp about 20 times in last year without even looking for it most people agree that there´s no other similar service to adsense in question of quality, ad targeting etc, but there are some type of sites which can do even better with adbrite. my tip: just use search button here on DP and you´ll find all important answers to your question
thats sad to know that, but if you think it wasn't fair( you *did* followed their terms) you can generate a support query, and chances are you will get the website approved again.