I just pulled out an old iPAQ 3650 and put the SereneScreen saver on it...
Even though the number of colors in its display is less than the 3900 series and above, it does work well and looks acceptable. It appears that it should work on just about any iPAQ model from 3630 to the 5555 and the newer ones of course. Just thought you might like to know in case you have limited test machines.
