Linux Format has a review of Bookcase in its May 2004 issue, #53. They don't post their reviews online, so you can't really go look at it, but Bungalow News in Pasadena finally had a copy a couple weeks ago, and I snagged it. The review is in their Hot Picks section, and it's rather lauditory.
Despite the odd glitch here and there, Bookcase is maturing well and is a first-rate method for organising collections of any kind. It has all the hallmarks of a great app: simple, flexible, fast, and pleasant to work with. If - like us - you're having a nightmare keeping track of books, DVDs, and CDs, it's a godsend!
Thanks! The review is for version 0.8, and the latest at the moment is 0.9.3, so maybe some of the odd glitches have been ironed out. As always, if you find something that doesn't work, or is non-obvious, please let me know, and maybe the Bookcase Handbook can be updated or the app can be fixed.