Yo, after the new Battlestar Galactica, Showtime's Sleeper Cell has quickly become my favorite TV show. It makes 24 look a little cartoony the way the BBC's Footballer's Wives makes ABC's Desperate Housewives look conservative and boring by comparison.
Sleeper Cell is about an Al Qaeda terror cell in L.A. plotting a coordinated attack on U.S. Soil. The cell is infiltrated by a Black Muslim FBI Agent Darwin Al Sayeed. To summarize: the show is tight, it's realistic, the characters are complex and developed, there's sex, swearing and a fair amount of violence. Like I said, 24, through no fault of its own on network TV, doesn't have the luxury of nudity and swearing. However, Sleeper Cell does well to give the show a gritty, realistic look and feel - and they use the names Jihad, Al Qaeda and Osama Bin Laden, where 24 has these vague, cartoon character bad guy terrorists.
Check it out - you won't be disappointed. Check out Footballer's Wives while you're at it.