mod_rewrite rules for printer-friendly URLs and beautified tag URLs

It took me a little while to get this just right, but these two mod_rewrite rules will do silent rewrites to allow you to have a printer-friendly URL and a beautified tag url like http://www.domain.com/tag/data-retention without having the URL redirected to a different location as far as the content in the browser address bar is concerned.

RewriteEngine On
RewriteBase /
RewriteRule ^printer-friendly/(.*)$ $1?printerfriendly=1 [L]
RewriteRule ^tag/(.*)$ mt\/mt-search\.cgi\?IncludeBlogs=x,y,z\&tag=$1\&limit=20

Include whatever blog IDs would want to be searched where you see x,y,z. Put this in the htaccess file at the root of the domain.