One of my brother in laws is from Texas. I can't remember where, though... I want to say somewhere right outside san antone... Anyway he lives in Cali with my sister and both of them get teased for their accents. My sister because she talks like a "new yorker" and my brother in law because of his Texas accent. I don't have a hard time understanding him.
I know there was a discussion about dialects and accents a while back.
I found this web site that has sound bytes of different accents from around the country.
It is really neat to listen to them, this link has all the Texas samples:
http://web.ku.edu/~idea/northamerica...exas/texas.htm