Alright, first you go to anidb.net
. Then you sign up for an account. Once you've done that, you start voting for that stuff you've watched. Then you go to myplace, choose hint from the right and get yourself some hints on what to watch.
You can also search for stuff you liked on anidb, and from there click the recommended link which will give you stuff recommended by other people who liked the same anime.
Also, go to www.animenewsnetwork.com
and go through their top 250 or whatever it is and look for stuff that sounds interesting to you.
Stuff doesn't have to be new to be good.