Thanks, Business. A few basic tips, though you have probably found most of these on-line:
1. Arrive early!! Traffic is horrible in Houston, so if you are from out of town, get a hotel near the school. If you are going to show up late, call them.
2. Dress to impress - shave/groom, get a haircut (and use gel if you need it), and wear a suit and tie.
3. Prepare for the most common questions (e.g. why an MBA, why now, why Rice) and a few tough questions as well (you can find a bunch on-line).
4. Prepare for your interview out loud, practicing as if you were actually speaking with an interviewer.
5. Relax and be yourself - don't be too cocky, but arrive, speak, and walk out with confidence.
Good luck. I wish you the best.