I watch them, just so I can blog about it. To my knowledge the current line-up is What If?, Because Lives Depend on It, Pracitcal Tactical, and Conceal Carry School.
So far, Practical Tactical is my favortie, just becuase it appears to cover a greater variety of material and in a practical manner.
There's also a Personal Defense TV on the Outdoorsman Channel (I only noticed it after I got HD, so I don't know if it's new or not). This show is a Guns & Ammo affiliated show and use their style folks. It's a pretty good show, but I usually don't like their hand-to-hand stuff.