There are some nice games for the old Palm smartphones. The N900 has an emulator of the Garnet OS (although it is not very well known). You can run most games and applications from the emulator. Just put the .prc file anywhere on the N900 and 'install' it in the Garnet VM ([Only registered and activated users can see links. ]).

Here are some screenshots of the Garnet VM:

[Only registered and activated users can see links. ]

[Only registered and activated users can see links. ]

Here's a link to the Garnet VM (this version should never expire) with some torrents of apps and games:
[Only registered and activated users can see links. ]

Here's a direct link to many games:
[Only registered and activated users can see links. ]