In case you couldn't (or wouldn't *lazy*), we are here to provide the masses (but mostly ourselves) a place to catalog our media collection, whether it be books, DVDs, CDs...
And we're more than just that. We're providing a place for the packrats to commune and orate.
P. Heymann, D. Ramage, und H. Garcia-Molina. SIGIR '08: Proceedings of the 31st Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, Seite 531--538. New York, NY, USA, ACM, (2008)