I recommend checking out Shared Copy by clicking here!
For my top 10 sites for bookmarking and annotating webpages click here.
Thanks to Richard Byrne's blog for the tip.
"We may not have ended up where we intended to go, but we ended up where we needed to be." Douglas Adams
Instapaper is a cool site for bookmarking that I found out about on Twitter from the wonderful education consultant, Naomi Harm. After signing up a user installs via drag-n-drop a bookmarklet into their browser toolbar. Then after finding a site that you want to read later just click on the button. This also works well for using on a variety of mobile devices.
Markup is a great bookmarklet that I found out about from Free Technology 4 Teachers. This is excellent for annotating (drawing or writing text) on a website and then sharing it w/ others.