BookDB also has lending library features. With them, you can add borrowers, loan out books, add multiple copies and so on.
I've been asked several times how many books the program can hold. In theory, over two thousand million. (When I was a kid, a billion was a million million. That's inflation for you.) In practice, if depends on the speed of your computer. For example, I have a database of 2400 books and my Athlon64 3400+ displays the lists in a blink of the eye. To test larger databases I generated one with 30,000 books, 15,000 authors and 3,000 publishers. It was certainly useable, although there were short delays switching lists. At the end of the day, it's a trade off - if the average database was something that large I'd rewrite the program to make it more efficient on big files. Of course, then it would be less efficient for smaller ones, and as it's primarily a home & small library program I think the current method is best.
What's new in this version:
- Removed the '& Unknown' entries which cropped up after a LibraryThing import.