What a stellar app!! Using it on Snow Leopard, and it works great. From what I can tell, it has no competitors. If you frequently take advantage of your local public library, this app is of great help keeping track of what's checked out and what's on hold. The fact that it can also log you into the library's website automatically is a wonderful bonus. I haven't tried the iCal integration yet.

There's only one thing I'd like to see as an option in the future. My menu bar is starting to get cluttered. Instead of a menu bar item, I'm wondering if a dock item could be an option (which would display the number of items checked out, just as the Mail dock icon shows the number of new messages).

The developer's website alludes to an iPhone version but I didn't find an ETA. Looking forward to it!