I compiled ScummVM 0.8.0 for iWMMX PXA270 (ie SL-Cxx00 on RC12). It works great in 640x480 fullscreen (instead of 320x240 with older versions). All your Lucas Art games should run (including Monkey Island 3 if you set your CPU @ 624 Mhz) and a lot more (Beneath a Steel Sky, Fight of the Amazon Queen, Broken Sword ... are freely downloadable on http://www.scummvm.org/downloads.php). MP3-Compressed monster.so3 is supported with DOTT (tested and recommanded) but .sog OGG-compressed won't work.
Please report any wrong behaviour. IPK is here : http://zaurus.maxg.info/