Sure, here's the mod_rewrite guide straight from the horse's mouth 
http://httpd.apache.org/docs/2.0/misc/rewriteguide.html
Here's a nice beginner's guide:
http://www.addedbytes.com/for-beginners/url-rewriting-for-beginners/
...with a little cheatsheet for some of the common commands:
http://www.cheatography.com/davechild/cheat-sheets/mod-rewrite/
Consider what sort of links will last the test of time & also create kick-ass content that will attract natural links