I only know him as Palmer from the show NCIS, but i think he should become a regular. He should be arround much more. He is funny, smart and good looking. The episode About Face was really awesome because we got to see so much more about him then just the "autopsy gremlim" and his acting surprised me. He is really talented. If he is a regular we can love him every day!
What i noticed when i was watching NCIS season 1 the last day was that Jimmy has a lot of thing in common with Gerald Jackson. (the one who got shot bij ari) But other then that, I love him!