WebNotes is an online bookmarking service that has been around for more than six years. It allowed users to highlight, annotate, clip, and bookmark resources. I thought it was a good service and many others did too. Unfortunately, not enough people thought the same way and now the service is shutting down. On November 1st WebNotes will go offline. If you have been using it, you should export your data now. You can find a guide for that process on the WebNotes transition page.
A few services that offer similar functionality as WebNotes are CiteLighter, RefME, and Diigo.