There is a new ipdf out. This time rincewind added "Quick Erase patch" [pausing stylus on screen erases last written; there is a avi video, which explains it much better.]
http://forum.irexnet.com/viewtopic.php?t=1241
OT: iLiad has got /usr/bin/md5sum, which I tested to check checksum of installed ipdf or back-up file, & then scripts does the correct decision. Right now I feel a bit trapped.