There are of course quite a few
http://www.fredstexascafe.com -- More what I think of as the heart of Ft. Worth, burger joint by day, gourmet funky at night.
http://www.reata.net/with_flash.html -- Decent food a bit overrated in my opinion
http://www.lannyskitchen.com/index02.php -- Very good food not cheap but quite the place.
Now not the best of the steak houses but an institution in the Stockyards http://www.guidelive.com/portal/page?_pageid=33,97400&_dad=portal&_schema=PORTAL&item_id=5696
Of course there is the standards Del Frisco etc. but those you can go to pretty much anywhere.
For BBQ I would go to the Railhead http://www.guidelive.com/portal/page?...