Being part of the awesome Sencha Team, I did shoot a quick attempt to run Sencha Touch, more precisely its Kitchen Sink demo, on Maemo-powered Nokia N900. Since Sencha Touch targets WebKit but Maemo default browser is Gecko/Firefox-based, I crafted a mini launcher which wraps Sencha Touch in QtWebKit. The screenshots below serve as the proof:
Most of the stuff works just fine. There are some minor issues and performance problems, but I worry not. With the amazing amount of optimizations Qt+Nokia put in place for Qt 4.7 and QtWebKit 2.x, writing applications for Maemo/MeeGo will be fun (again).