I'm not sure how "microbrew" they are, but my favorite brewery is Great Lakes Brewery from Cleveland.

I'm looking for their Christmas Ale now and it's a real problem finding outside of a pub or two. And I want a couple of six-packs for the home! They also have a regular IPA, the Commodore Perry, that my wife and I love (our favorite beer by far). Another of their favorites is the Edmund Fitzgerald Porter - a truly flavorful drink. And another really fine bottle is their Lake Erie Monster Imperial Stout - a robust 9.3% ABV ale that is simply wonderful to sit back and sip after work.

When I've been in the San Antonio and Waco areas on my "TDYs", I tend to drink Shiner Bock. Again, I don't know how "microbrew" Shiner is, but it does give me the Texas beer experience.