Baka to test is good, the second season just ended not long ago. It's a good comedy, some odd jokes at times and a cast of very odd characters. Some of the episodes range from outright stupid comedy to very cute and sweet.
Angel Beats is very good. Quite dramatic and heart wrenching at times but still has quite a few funny moments.
School Days if remember correctly seems to start off as a normal romantic show then takes a messed up turn somewhere and gets pretty dark.
I would definitely recommend Angel beats, but Baka to test is good too ..... .