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Read through Brad Feld's "term sheet" tagged posts: http://www.feld.com/wp/archives/category/term-sheet - you can pretty much become an expert on term sheets.

The Venture Hacks archives have a lot of good reading material:

http://venturehacks.com/archives

I second the Venture Hacks recommendation.

In fact, that entire site should be read by any entrepreneur who wants to grok term sheets. Possibly the best resource to dive into the material, from an entrepreneur's perspective.

Read the blog start to finish, then go buy the Pitching Hacks PDF.

Once you want to gain an understanding of the subtleties of terms, and see different terms considered, check out TheFunded.com.

See http://www.startupcompanylawyer.com/