you might talk to the Opera people. in addition to having a PC-type browser that runs on multiple platforms, they have slimmed-down versions that run on various embedded platforms. they've got a smallish version that runs on the Nokia N800 (a linux-based handheld device) which has decent performance and does ajax (i'm not sure what standards or test suites apply, but google mail and one other ajax-ish site i use work, which is all i really know about).
they're not open source and i believe you'd have to get their approval for redistribution; not sure how that squares with any religious convictions. anthony
