Another similar website was just launched: VHX (http://vhx.tv). It's currently in a closed beta, but they're slowly sending out invites. I've been using it for a few weeks now and it seems really nice, allowing you to choose things to watch later in addition to cataloging every video you watch on the internet (it spans tons of sites, way more than just Vimeo and YouTube).

Fun fact: Former Vimeo developer Casey Pugh is one of the people behind the site.