Ten ways to use LinkedIn

By Guy Kawasaki

1. Increase your visibility
2. Improve connectability
3. Improve Google Page Rank
4. Enhance search engine results
5. Perform blind, “reverse,” and company reference checks.
6. Increase the relevancy of your job search
7. Make your interview go smoother
8. Gauge the health of a company.
9. Gauge the health of an industry
10. Track startups

Detailed info at http://blog.linkedin.com/blog/2007/07/ten-ways-to-use.html