preenv lets Palm Pre games run on Maemo
Javier S. Pedro, developer and former Community Council member, has released a prototype package which allows playing of native Palm Pre games on Maemo. A "native" Pre game is written using OpenGL ES; rather than the JavaScript and HTML of typical WebOS applications. Screenshots show The Sims and Need for Speed running; although you'll need a Pre to get hold of these commercial games.
preenv is currently in Extras-devel (and at a very early stage of development) and is licensed under the LGPL. It works by providing an environment with stubs for Pre functions not supported on Maemo, passing through accelerometer and sound control to the underlying OS. As the underlying hardware of the Pre and the N900 is so similar, performance of the games looks reasonable.