These guys have the info but they don't do search-engine optimizaton...
DSIRE: Incentives by State: Incentives in Texas
The federal incentives are due to expire at the end of 2008 but the national solar industry association has been nagging Congress to get going on that. It'll probably get fixed after the election during the lame-duck session.
The book written on E-R.org, "The Military Guide to Financial Independence and Retirement", on sale now! For more info see "About Me" in my profile.
I don't spend much time here anymore, so please send me a PM. Thanks.