http://www.playdeez.com/jsjetlag.html
The stuff at the bottom of the page (at least in theory) allows a user to create an account/login/logout/etc.
When a player is logged in, it starts recording jetlag games played while on the page, and puts the statistics at the bottom of the page.
Yes, there is still some tweaking to do, but the functionality is there.
My Chumby just arrived. It's got a tilt-sensor in it, which would be an ideal interface device for JetLag. I might have to get working on it.