[ark15]

I use evernote (wish there was a better alternative) for notes I create but I use http://diigo.com extensively for online content that I consume.

Why I like diigo -

1. Available everywhere - they have good, working extensions for popular browsers, native apps for mobile

2. You can highlight and annotate parts of web pages and if you visit that page again while logged in to diigo through the extension, it will show you your highlights/annotations

3. Tagging & bookmarking (I switched from delicious while it was in future:uncertain state)

4. You can create groups and add links to groups (e.g. I use this feature to share links and my comments with my wife on topic we are concentrating on/discussing)

5. Share feature. Very easy to share a link and a quick note to anyone with email address

6. It has other _social_ features (share on twitter/facebook, etc.) but I don't use those

I am not affiliated with diigo in any way. Just a happy user.