Absolutely, QML + JS and webkit are they key here. There should be a way to package such an app (with all the artwork and what not) and deploy the same way on Symbian, Maemo and all desktops Qt supports (I get that not all of them will have identical input methods but the code should run). The upside of running these on Nokia devices should be that it all comes heavily HW accelerated (and battery efficient) on the back end.