Apache Rewrite Cheatsheet
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This is the life-saver cheatsheet you need if you're ever going to want to understand complex rewrite rules like the ones generated by the Boost module in Drupal:
http://www.askapache.com/htaccess/mod_rewrite-variables-cheatsheet.html
In particular, in RewriteRule .* - [S=5], the [S=5] rule means "skip the next 5 lines". It can represent a considerable efficiency boost!