The Gp32x community are a good possibility for help on getting these ported, the release of the community developed open handheld, the Pandora is imminent, like the N900 it is also ARM based with very similar hardware. It obviously has dedicated gaming controls so theres a big incentive to port open source games. If these get ported to the Pandora, then most of the hard work will be done to get them running on Maemo.