I have been trying to earn from Adsense from last 1 Year, but I dint' earn $100 if you are earning then let me know and please share some tips so that I would also earn with Adsense..

Adsense makes sense if you really have very popular sites. By popular, I mean more than 10k visit per day. 100k per day is even better.

Than you have to position your ads in a location of your page where they will be more visible (inline with the content, top, top left) but don't make your site look like MFA (made for ads) because people usually close this type of page, and also you can be penalised by SE's.

So if you get 100k daily traffic, and you aim for %1 PPc and each click is about 10 cents, than you are on the way to make your $100 per day