WordPress Underscore Plugin
While I’m in the mood for releaseing code, here’s a quick and easy plugin for WordPress. If you’re like me, you prefer the ‘_’ underscore character in URI’s much better than the default ‘-’ dash in WordPress. Just unzip this file into your plugins directory, activate it, and it will sanitize your URI slugs with underscores instead of dashes. I’ve only tested this on my install of 1.5, so I’m not sure if it works on anything older. If anyone wants to test it for me, let me know how it works.