There is PhoneME from DavyP which works really great! I am able to run the most jar games and apps from my old symbian phone.

Here is a link
http://talk.maemo.org/showpost.php?p...&postcount=412

You have to download the deb file. Then you can install the deb file as root using

dpkg -i

This installs also a gui which can be used to start jar and jad files. It is possible to change between portrait and landscape mode.