Google NotebookIf you want a convenient way of organizing information from various websites you visit while researching a topic, Google Notebook (in beta) can help. As explained in the FAQ, "With Google Notebook, you can browse, clip, and organize information from across the web in a single online location that's accessible from any computer. ... You won't ever have to leave your browser window." All text information in your notebooks is searchable.
To use Google Notebook, you need to download a browser extension; there are versions for Internet Explorer 6 and Firefox 1.5+.
To familiarize yourself with Google Notebook, you can take a brief tour.