A couple of weeks ago, when I was participating in a gift ideas carnival, one of the topics was gifts for book lovers.  I just thought of another idea that fits this category:  a membership to LibraryThing.  For those of us who have a lot of books, this is a very handy service!  Membership is $10 a year or $25 for life, and it allows you to catalog all of your books.  This catalog is then searchable, taggable, etc.  You can even make notes on the books you have listed.  It also makes for an interesting community, as you can see which other users have the same books you do, and browse their libraries to see what else you might be interested in reading.

If you don’t want to hand-enter every book, you can use a bar code scanner.  I think that any standard bar code scanner will work, such as the Symbol LS2208, but LibraryThing sells one, too.  (In fact, if your recipient already has a LT membership, then the scanner itself might make a good gift!)