My home port is Shreveport, LA, and I'm close enough to S. Texas that I've done some research on Hobie sailing in your area. The jist of it is that Hobie Class Association (HCA) sanctioned Hobie regattas emphasizing one-design Hobie class racing is dead in South Texas. They have gravitated towards open multihull regattas in which boats of different classes compete on a Portsmouth handicap basis. I prefer one-design, it's more competitive. But if open regattas are what you've got in your area, participate, they'll welcome you with open arms. A new HCA ruling allowing non-Hobie F18 classes to compete with Hobie F18s at HCA events may change Division 6's mode of operation to some extent.
On the other hand, the H20 is very active in Divsion 14, N. Texas, Oklahoma, S. Kansas and Arkansas. Since Shreveport is practically in E. Texas, I race with Div 14 and am a member of Hobie Fleet 23 in Dallas.
That's the low down from my perspective.
Here's a list of links that may be helpful, probably some of the same ones that Wessels is sending you:
Hobie Division 14,
http://www.div14.hobieclass.com/Hobie Division 16,
http://groups.google.com/group/division-6 note that their home page has a picture of a NACRA on it - We plan to organize a Shreveport fleet this winter and this photo is an indication of why we want to organize as a Division 14 fleet rather than Division 6.
Hobie Class Association,
http://www.hca-na.org/, click on "contacts", then click on "fleets" and you'll see a list of all the North American fleets, including six in Texas
Hobie Fleet 23,
http://www.hobiefleet23.com/Texas City Dike Yacht Club,
http://www.tcdyc.com./Shreveport Yacht Club;
http://www.shreveportyachtclub.memberlodge.com/, not in your immediate area, but I'll give my club a shameless plug any chance I get.
Mariner Sails, Dallas Hobie Dealer,
http://www.mariner-sails.com/, outstanding service!
Hope all this helps.