I used to run some extra security programs on my Palm PDA (e.g.:
PDA Defense; briefly tried
SureWave Mobile Defense; never could get
PDA Secure to work right; tried out
TealLock, too), but on the PPC PDA I'm just using the standard lockout. I set it for
Prompt if device unused for zero minutes and got in the habit of always pressing the power button when I was done using it so that it locks immediately and taking the PDA with me when I left.
If I were looking for one for the PPC,
this list would be a starting point.
Welcome to Aximsite, Plats!