Love tools like Goodreads and LibraryThing for tracking your books but wonder about your Music collection, DVDs or games?
lib.rario.us might be the solution for you! This online cataloging tool allows you to catalog DVDs, musics CDs and video games in addtion to your books!
You can add items two ways, by dragging a bookmarklet to your tool bar that allows you to add items as you're browing Amazon or by typing them in manually. You can also import your library from LibrayThing.
Like so many of the online catalogs you can add tags to your collection, write reviews and see who else owns them.