Don't know such a website/software, sorry.
http://www.bryanboyer.com/indyjunior/
It doesn't do real-time but lets you plot and show movement. Data is
fed via XML so in theory you could whip up some procmail that changes
the XML when you email a command to it or something.
Come to think of it, that may be cool.
It is a very slick little app though.
I have not tried it yet.
I really don't understand why someone trying to break new ground in IM
for crying out loud doesn't bypass the whole outdated desktop computing
model and just go for where something like this is actually useful.
Messaging and Presence MUST be mobile applications.
I have to say this looks completely idiotic.
. . . . Messaging and Presence MUST be mobile applications.