Partisan websites:

Orangebloods.com—primo Longhorns football site, including the best recruiting info anywhere.

Hornfans.com—free (and freewheeling) Longhorns-related sports forums.

HornFanHoopty—a "good group of folks dedicated to enjoying Texas Longhorn Football." (Nice car.)

MackBrown-TexasFootball.com—"The official site of The University of Texas Longhorns."

TexasSports.com—"The official site of University of Texas Athletics."

The University of Texas—need I say more?

General sites of interest:

Current Longhorns statistics—courtesty of USCPN.

Division I-A football statistics—all teams, NCAA.

Texas Longhorn Athletics—the last word from Wikipedia.