Recently become a fan of some of the Alt-country acts out there and the rock bands that split off from them. Uncle Tupelo, Son Volt, Wilco, & Whiskeytown in particular.
Been a fan of classic rock for years now (Zeppelin, Cream, The Boss, etc.)as well, though I also love some of the current bands out on the road these days as well, groups like Drive By Truckers.
Then there are the times when I just need to sit back and take it easy, then it's time for Miles Davis, Thelonius Monk, Coletrain.