Every brush I've downloaded are within these websites.

http://creativechaos.org/
http://7-days.net/
http://angelic-trust.net/
http://anotherbrushresource.com/
http://antibrush.tripod.com/
http://www.artric.com/freebies/
http://brushes.poetic-tragedy.com/
http://memento.fredfarm.com/
http://www.blueyed-attitude.org/brushframesite.htm
http://brushabrusha.com/php/list.php
http://www.cirratus.org/brushes/
http://classic.tere-art.com/
http://www.damnedinblack.net/brushes.htm
http://www.dubtastic.com/
http://brushes.echoica.net/
http://brushes.nenuphar.net/
http://www.forbidden-fire.net/brushes/
http://www.1greeneye.net/
http://www.laguiafacil.com.ar/maquidq/any/ibrush/index.html
http://www.inferno-sprite.com/
http://www.rebel-heart.net/brushes/
http://nocturna.net/brushes/
http://shockmesane.net/brushes/
http://ink.deconstructing.net/
http://pretty-brush.web1000.com/
http://www.seafairy.com/brushes/
http://www.secretloft.com/
http://amadaun.net/brushes/
http://www.studio911design.com/
http://annikavonholdt.com/brushes/800.html
http://truly-sarah.com/
http://unyielding.org/brushes/
http://vanilla-dreams.net/
http://veredgf.fredfarm.com/vbrush/main.html
http://brushes.valley-grrl.net/index.php?x=brushes.php
http://www.itsuji.net/brushes/
http://www.1womanmob.com/brushes.html
http://www.8nero.net/brushes/index.htm
http://www.hybrid-genesis.com/insom_brushes/
http://colour-dreams.net/
http://www.jenah.net/
http://www.kissmypixels.com/
http://www.nymphaea.org/
http://www.glitters-designs.com/
http://www.just-dreaming.com/
http://nadine.fan-arts.net/
http://www.elisabethan.net/brushes
http://kathrynmerteuil.free.fr/brushes/#
http://classic.tere-art.com/
http://www.shockmesane.net/brushes/
http://www.roshiweb.com/petit.html
http://ti-fi.com/digitalbristle/

Other resource sites I've downloaded from:

http://www.webteknique.com/
http://share.studio.adobe.com/Default.asp