I've ported our graphical application platform eyeGT to the PSP and have made some demos with them:
something simple like a clock:
You can grab it from here
for other variations go to http://bareblogs.com/BB.php?itemid=7
A nice graphic demo, also available for other platforms:
download it here
more info at http://bareblogs.com/BB.php?itemid=8
I guess the more interesting one is the SVGViewer:
download the SVGViewer for the PSP from here
more info at http://bareblogs.com/BB.php?itemid=10
Cheers,
Lev