If anyone here finds that they really like The Wire, then I strongly recommend that they check out the Generation Kill mini-series, which I just finished watching.
Based on the book of the same name, Generation Kill follows the members of a US Marine Recon unit during the invasion of Iraq in 2003. It's made by many of the same people who made The Wire, in the same naturalistic style, and I thought it was just as good.
I even features some familiar HBO faces as actors. James Ransome (who played Ziggy in S2 of The Wire) is particularly memorable as a motor-mouthed Marine, but Lee Tergesen (who played Tobias Beecher on Oz) also shows up, as Evan Wright, who wrote the book on which the series is based.