If you're of the same mindset and don't dig Flash, then tune into CPAINT.
The ASP proxy implementation is a little dated, but before you ASP.NET heads shudder and walk away, let me say that you can port the ASP proxy to ASP.NET in about 48 seconds, approximately. Its only about 20 lines of code.
Software: CPAINT Project
Cool Demo: Magnetic AJAX
For those interested in further info on AJAX, Jesse James Garrett (great name!) over at Adaptive Path has put together a really solid article