It shouldn't be necessary to register with name and email address. It should be sufficient to enter your payout address into a field of the applet (if applets are able to communicate this to the server), otherwise use an HTML form field or allow the Bitcoin receiving address to be appended to the URL of the "generate" page.
I hadn't thought of doing that, I'll definitely consider it.
One problem that I'd need to work out first: what would I do if you didn't generate enough to cover the fee of sending it? eg only 0.005 BTC. Right now it just goes in your account until you mine enough. Hmmm I suppose I could store how much has been mined for a certain bitcoin address and send it once there's enough. I'll have to think about how to do that with my current system.