Fasinating idea but I think your missing something - how does the applet communicate with the server?
As a delivery system for single apps it's an excellent idea although you have to include a decent version of UAE and Amiga OS with every browser
The AmigaOS is a question of negiation and money.
The decent UAE is a different question altogether, yes you can get it on other platforms but have you ever tried it? I tried the BeOS version once, I gave up *very* rapidly.
As I said it an excellent idea but the problem is implementation, get that sorted and you're potentially onto something.
But then you're back to the problem of the apps communicating with the back end server or client...
I don't think the problems are un-solvable.
Definately worth more thought.