I have just ported Virtual GameBoy Advance (VGBA) to Maemo OS2008. Get it from this post or from the web site:

http://fms.komkon.org/VGBA/

This version is highly optimized and uses code from the Symbian version. Thanks to those optimizations, VGBA-Maemo should run at almost the original GBA speed. Please notice that VGBA-Maemo is currently in the beta development stage. Test it and report any problems.