Don't know why I haven't posted this here before, but for anyone who hasn't seen it, you should fix that.
The show is on it's 4th Season now, and I think it's one of the best shows on TV. The basic jist of the story is the lead character is a spy who got fired (burned) and he's trying to find out who did it so he can get back in.
What makes the show so awesome is the dialogue is very well written and the show manages to make pretty much everything plausible (unlike say 24, which I still like). The lead character basically gives you a run down of all the gadgets/ideas as he's doing them and you find yourself sitting there thinking "I could see that working".
Seriously, if you haven't seen it, watch it. However, you really want to start from Season 1. At the very least you have to start at the beginning of a season as many of the episodes have linear elements so if you start watching in the middle some parts won't make sense. Seasons 1-3 are available on DVD and iTunes. Season 4 is currently airing and is available on iTunes Season Pass or streaming via Hulu.