Google has just released Chrome, their new open source web browser. It seems to work just fine with aprs.fi, and it's blazingly fast too. Windows only, for now. They have a nice cartoon describing the internals of the browser. I'll add it to the list of supported browsers. Their EULA has some issues, though.
By the way, I'm shopping for an used iPhone or ipod touch. I need it for debugging and maintaining compatibility with aprs.fi. If you have one to sell or give away, let me know.