Look under the Just added heading. Some nice rock textures.
http://www.pixologic.com/zbrush/downloadcenter/texture/
Yes, they have some nice textures, plus alpha maps, matcaps, etc.
I was entertaining myself reading all the forum message traffic concerning the release of Zbrush 4.0. The feeding frenzy is about to begin! Guess they are sending out the download emails to those eligible for the free update on a random basis.
There are a lot of CGI guys wetting their pants right now.
Nice, I had not seen that alpa section.