I have a Kobo ereader, and I love it to bits. Thanks to Gutenberg.org (and the books I've purchased, and my local library), I have about 1300 books on there; I'm working my way through them. And no, that's not an absurd amount to read—I can whip through a 400+ page book in about 5 hours or so.
Anyway, I use the Calibre software to manage my books, but I'm finding I'm newly addicted to Goodreads for putting up the books I own, the ones I've read, the ones I'm reading and the ones I intend to read.
I have a very acquisitive nature, and coupled with my obsessive need to organise things that can be organised, I'm finding Goodreads feeds into that nicely. Anybody else here share that problem?