cross-platform with GUI in a package

[pobox at verysmall.org]

Hello,

has somebody done a cross platform (Windows XP, OS X) GUI wrapper around 
rsync so that end-users can backup selected files/folders on a remote 
server by point-and-click?

I am aware that on Windows XP it is possible with the help of the cygwin 
binary - but I am not sure about the GUI - I had a look at PHP-GTK, 
tcl/tk and Java (it should be a scripting language). On OS X do not 
know. A one file installer would be good as well.

Thanks,
Iv