http://www.alplm.org
Jamie, E.J. and I have visited the majority of the Presidential museum's and the Lincoln is one of the best! If you get near it, by all means, enjoy it and the history. Also, the Lincoln grave site is nearby so visit it as well.
Jamie,
We did the Lincoln Library about four years ago (it was the new library). It was excellent. We have been to about 5 other Presidential Museums and it is the best so far.