Ever click on a mailto: link, only to scream in frustration as Apple Mail opens yet again. The curse of the Webmail user is that there is no way to get around this problem. That is, until now.
Webmailer is an unoriginally named program that catches mailto links and sends them to your favorite webmail system. You can set it to open any URL or run any shell script, complete with the parameters lifted from the mailto link.