Where to find Photoshop Brushes

PS Wish Summer '08 Best Brushes
Kinda speaks for itself. But there's a couple sets of great brushes here.

Splatter, Spray, Grunge & Watercolor. I've tried none of these, but some look pretty decent. If grunge is your thing, you'll find plenty to amuse you here.

Brush King Their tagline is "Lots of Free Photoshop brushes" which is true. Some are excellent, some are poor, but the selection of excellent brushes seems slightly higher than deviantart, and it loads a lot faster.

Deviantart Brushes I don't think much of Deviantart. Way too much sucking up, way too little actual critique and way WAY too many ads for premium memberships. I refuse to put my stuff there. But their brushes section is huge. Mainly, it's full of junk, but a few are excellent.

Light, Lightning, Stars, etc
I love lightning and galaxy brushes. Though they do tend to be somewhat of a one-trick pony.

http://spanish.brushesdownload.com/brushes.asp?offset=1296 I just found this the other day, so I haven't even tried any of these, but a lot of brushes, and they're catagorized, which is great.