>>2210742pixiv.net - You have to search under Japanese names though.
allgayart.com - Newish, so it's collection is kind of small.
y-gallery.net - Good for looking for specific artists, but has a crummy search engine and tag system.
DeviantArt - It is what it is.
Honestly,
rule34.pahael.net is the best. It doesn't have every piece of porn on the net, but it has most of them.
