I have one made, just trying to figure out how to share it.

I can't find anywhere on the Mozilla development site that just lets you upload the xml file. They want to make me fill out a form that builds the plugin for me. Problem is that their form isn't really powerful enough to actually make a decent plugin. What am I missing?

For now it has been uploaded to: http://www.lorebroker.com/ycombinator.xml

Just download and stick in your searchplugins directory (C:\Program Files\Mozilla Firefox\searchplugins in Windows) along with the other plugins you find there.