I've long used Evernote for my own personal notetaking on the web(although I have recently been migrating to Diigo for my online annotations), this post by Shawn Miller is such a great explanation of the tool that I'm going to move Evernote back into the forefront of my notetaking. I do love the mobile Evernote app on iPhone. It makes it very easy to not only take multiple kinds of notes (audio, text, image) but makes it easy to share those notes.
Another timeline tool that allows for addition of text events along a timeline. It's still in beta, but relatively easy to use. Not a lot of bells and whistles. Can import from Flickr, Wikipedia, but I haven't found that you can embed video, yet.