I've only been around for a year and feel unqualified to offer you any meaningful suggestions. I hate to see your thread just sitting here, though, so here are my opinions to help bump your thread some:
Ft. Worth Zoo - A tremendous experience for your family. On a good weather day the full walking tour will probably be very exciting for your kids and a little exhausting if you take everything in. Luckily, the train is situated to get you quickly back to the Zoo entry point once you've seen everything.
Food/BBQ - I really prefer David's in Pantego (Arlington, essentially). They have the best brisket that I've had in the Ft. Worth area. Arlington - in my opinion - offers quite a delightful selection of eclectic restaurants and one of only TWO Jamaican restaurants in all of DFW. There are lots of BBQ and steak joints in the Ft. Worth Stockyard section of town. The atmosphere is good, better than the food, in my opinion. It's always nice to be able to enjoy beer and BBQ in a very casual environment. Another Arlington beer and food joint: Fuzzy's Taco - just tremendous.
Sports Venues - Arlington is the place to be (
http://www.arlington.org/sports_recreation/). Also, TCU appears to have a national champion caliber NCAA football team this year. It may be possible to get tickets to one of their games.
That's all I've got. When y'all decide to move here, I'll give you my $0.02 on the surrounding towns.
-Eric