One of my projects for this weekend was some search engine optimization work. I've gone from a system where most files on my websites have half a dozen URLs that work, to just one URL per file, and all of the old URLs 301-redirecting to the new ones. In theory, this should improve my search engine rankings, especially for EclipseCrossword, which is really the only one that I care about. Even if it doesn't, it makes my URLs cooler.
I am now an .htaccess and mod_rewrite ninja.