The ACM is looking to select the 20 favorite computer science book (as picked by ACM members) and make the full text available to the membership. To this purpose the ACM has set up a wiki so that members can discuss the books that have been nominated. The eligible books are all out of print. There is a second list of books still in print though. The web site is http://pd.acm.org/books/classics/camp.cfm
I looked though the list for a while this evening. I was amazed at how many of the books on the list I was familiar with. Some of them are still on my book shelves. Others I used for reference while I was in college or earlier in my career. I know that people tend to thing that any book about computer science is obsolete in a year or two but I was pleased to see some classic books for the 60s and 70s are still in print. Concepts! Concepts do not seem to change as often as implementations.