They're really anal about what websites they accept into the program.
I ran a picture upload app, and it typically had 20k views a day, with a total hit of 2 million or something.
It made about 600-800 a month. Eventually dropped it because people were uploading cheese and I couldn't moderate it all.
But anyway, generally, adsense isn't worth the effort unless you have a constant large amount of traffic that actually uses your site everyday, haha. Hope this helps.
Wow 800 a month is a lot. I could forget about a job and work on the site full time if it paid that much.