I always found that I got the best results from lifting early in the morning, but since I've moved off to college my class schedule (and the fact that I'm a night owl who usually doesn't go to sleep until 1-2 or later) just doesn't allow it. Instead, I lift about 7 at night, and like they said, it's better than not going at all....
One thing I've found, and lots of people agree on, is lifting that late at night will keep you from going to sleep as soon, or sleeping as soundly as normal.