I have been a fan for a while now, but am seeing new shows now that USAnetwork is showing them, and am GLAD of it!
Couldn't help but notice they don't do a lot of casting stars from many other shows, but the last night I was sure I saw Sawyer of "Lost" playing a bit part. Sheriff who found the Marine's leg on the steps?As this episode was dated from 2004, I wonder if this was before Josh Holloway was cast in Lost, and I do not recall seeing him in other stuff.

Sure am glad to see a fan site for NCIS, I think it's among the best out there. I have been in love with Lauren Holly since Picket Fences!

Four people come quickly to mind and there have been dozen of older and younger actors spanning at least 2 decades of TV.

The Dead Zone: John L Adams (Bruce) and Lochlyn Munro (Jason Moore from "Playing God")
Stargate Atlantis: Jessica Steene (the original Dr. Weir) Torri Higginson (Weir of s1-3)

Yes, he got that part before LOST. Another Lost member, Terry O'Quinn also did an episode of NCIS the first season as well as Emilie de Ravin.

Emilie too? Wow, I missed her, drat! I'll have to keep an eye out for them.
Terry also was in several of the JAG episodes over several seasons. Man, that guy is terrific.

Now that the strike is over, we ought to get more NCIS, but it doesn't look like we are going to get much new stuff in 2008.

"Jessica Steene (the original Dr. Weir)"
Man, I really thought for the short time she was in Stargate heading for Atlantis, that she was going to be great in the role. Never did find out why they switched her out. Torri was pretty decent, but something about Jessica just felt right.