— Facebook has blocked the ability to use this plugin. I repeat: It no longer works. To boot: It cannot be fixed, as Facebook has prevented bulk sends. It was fun while it lasted (RIP, Dec 2009)—
Sick an tired of clicking several hundred times when you want to invite your friends to a Facebook event? Yeah, me too. So I wrote a Greasemonkey script that does it for you. And just to be thorough, I wrote a bookmarklet too (for you non-GM people.)
Just to be clear, this code is GPL licensed, so feel free to use it, but keep it open.