In a new entry today, Tim Bromhead shares his method for creating "super friendly urls" for a site's users using mod_rewrite:
Today we are going to show how to make the URLs with spaces super easy to type for users. bla.st uses dashes in the URLs to represent spaces eg. http//bla.st/web-design/. We chose dashes over underscores because underscores can get lost with underlined links, and we think they look nicer.
He includes the Apache config information for working with the VirtualHost entry and the simple PHP script to handle the requests. It looks in the SERVER superglobal, at the QUERY_STRING to see what the user is requesting and does an append and redirect accordingly. This example is made to take any form of a space in the URL (including underscores and %20), parse it out, and pass the user along correctly to the page they want.