Planetsuzy.org is the biggest out there. One gets the most downloads there but you will get banned for using autoposter and the rules are quite strict and we do follow them ..

Do some searching before u post in there in PATM section .
once your link get distributed in that section you will see how much download you get everyday..
I used Filesonic to post there exclusively about a 2 months back and still i am earning about 1.5 $ daily without posting any new stuff.

It is big and very thoroughly maintained..