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By CNET staff (October 20, 2006) It's easy to suffer from information overload when the world's data is at your fingertips. What you need are tools that help you home in on the most relevant facts and organize them. We've rounded up (in random order) some great services that help you go straight to expert sources and keep track of your research. These digital tools can keep you on track--whether you're working on a middle-school science fair, wrapping up a graduate degree, or pursuing a hobby.

4. Diigo beta How helpful is it to bookmark a Web site if you need only one sentence from that 3,000-word article? Diigo is a free bookmarking service that lets you do what we wish Yahoo's Del.icio.us would: highlight text and comment on Web pages. Diigo caches each site so that you can search within text, not just the topic tags. And you won't have to leave the Del.icio.us community, since Diigo lets you save bookmarks simultaneously in both places.

2. Wikipedia You might shun this online, open-source encyclopedia if you've ever been burned by prank entries or fudged facts. But because anyone can edit Wikipedia, it's a richer resource than Britannica for subjects off the beaten path, such as the > 1960s underground press > or > rivethead subculture > . Though it's not the only source you should reference in term papers, at least Wikipedia gets you started. >