Safari doesn't support X.509 client certificates...

I really like Safari... It's fast and seems to work well on most websites. The only problem I have is that my work uses X.509 client certificates to authenticate with their secure intranet, and Safari doesn't support them. Does anyone know if there's a 3rd party plugin or some way to enable this support? I added the X.509 certificate into my keychain just fine, but I did a little googling and found that it just isn't supported. This is dissapointing, to say the least, because every other major browser supports it.

http://mailman.mit.edu/pipermail/macpartners/2003-October/000172.html