Here's my list as of today, with some comments:
Bill Davenport (go figure)
Francesca Fuchs (ditto)
Brad Tucker (on provisional status: he moved to Austin)
Susie Rosmarin (back from NY at last!)
Michael McKean (provisional status: moved to Richmond, VA)
Trenton Doyle Hancock
Jason Villegas (off at grad school, I think)
Robyn O'Neil (off in the suburbs somewhere, Kingwood, I remember)
Paul Horn (Tomball is close enough)
To be on my list, an artist has to live, work, or visit Houston enough to be part of the scene. My assessments are based on art I've actually seen, not secondhand reports, resumes, reviews or sales figures, and are of necessity incomplete. Email all complaints, comments and corrections to email@example.com, or just get in my face the next time you see me.
I'll update and repost my new list next summer, when there's nothing else to write about, so get out there and show me something!