Personally, as far as the beta goes right now I use either the talbuks or the zhevra from the original Recruit-A-Friend program, and I'll probably stick to them at release as well. I like the sound of hooves on roads, what can I say. The other thing I like about both of them is that they're small, so they don't take up a lot of real estate on my screen and I can actually look at what's going on around me. With how much there is to see on the beta, this is definitely a good thing. I suppose if I were going to use a flying mount as a ground mount, I'd go with the trusty Red Flying Cloud from the Lorewalkers. It's easy enough to get, it's low-profile, and my characters look cool standing on the thing.
What about you guys? Do you have a favorite mount you're going to break out for use in Warlords? Are you going to take advantage of the random summoned mount feature and favorites list? Do you have a preference to what kinds of mounts you use -- do you like the ones with hooves, the bugs, the bears, or some other variety? What are you going to be trucking around on in Warlords, and why?