> none of them support SNI. That includes (..) Google Chrome, FireFox, and Safari
You're wrong about Firefox! I'm writing this from an XP box and I've just tested a SNI site with Firefox 3.6. It works with SNI just fine.
> Not sure about Opera
Opera also works with SNI.
My apologies regarding FireFox. I don't use FireFox and when I do it is from a Mac OS X machine.
Either way Internet Explorer doesn't support it and as such it is still a no-go from a usability stand point since XP still has such a large market share.
http://en.wikipedia.org/wiki/Server_Name_Indication#Support
That is unfortunately an issue that only Microsoft can rectify unless developers on the Windows platform want to take the time and effort to re-implement parts of the SChannel API.