Carnivale is interesting but there's no conclusion. I thought I'd be able to deal with that but the last episode of season 2 had so many WTF moments that it's total kick in balls realizing that there will be no wrap up.
Yeah, it really makes it hard to recommend, despite how much I enjoyed it.
Some older HBO flicks that were good include RKO 281, which was about the making of Citizen Kane, with Liev Schriever as Orson Wells, and I really loved Don King: Only in America. Both worth checking out, the Don King flick even if you're not into boxing.
And I'll weep the day Entourage goes off the air.