Delicious is limited only to storing bookmarks and it would be better if it were made more comprehensive to cover the various sources of content that we access

Delicious is limited only to storing bookmarks and it would be better if it were made more comprehensive to cover the various sources of content that we access on a daily basis. Anybody here tried Zukmo as an alternative ? its a free cloud based tool to build your Personal Digital Library with bookmarks, documents, google docs, tweets, rss feeds, notes etc.