I won't post all of the obvious (classic) ones right away, but a couple favorites that I feel are drastically underrated. What are some of your favorites? The Decemberists Hazards of Love was IMO one of the top 5 albums of 2009. Saw them live at Lollapalooza and they killed the performance. Played the album front to back amidst the perfect dreary/rainy atmosphere. One of my favorite hip-hop concept albums is NightHawks (Cage and Camu Tao). This is definitely worth a listen if you like underground hip hop at all.