Clipperz - identity covers areas like attention, lifestreams and offical profiles like
Also check out the new features from the Internet Address Book.
iTaggit - tag all your collections, kind of like secondbrain but for physical content, also has community blogs like eBay…also see Squirl and Zestr.
LibraryThing, Listal, Reader2 and others do this for books (not sure if you can channel into collections), and there are several social wine sites like corkd, anyway I like the idea of iTaggit almost being the lifestream for stuff you own…just watch out for burglars.
Here are some more media managers: MediaMan, Delicious Library, Book Collection, BookBag (for your mobile), Collectorz, Book Library, ReaderWare, etc…
Smart Print - a browser extension for HTML to PDF, difference here is that you can clip sections from different websites into the one PDF to print, kind of like a Google Notebook and NoteFish, or even clipmarks and webchops, but for printing…also see HTML2PDF.