Locking your PDA

I have a lot of confidential client information on my Treo 650.  Password, IP Addresses, etc.  I have noticed that some of my clients have started to input sensitive information into their PDA's as well.  This could be a huge problem if you were ever to lose the device.  I found the security on the Treo 650 to be lacking, specifically, I did not want to type in a password every time I wanted to use my phone.  I recently discovered this program called mSafe  (16.99).  If I lose my treo 650, I can send a text message to it which will either wipe it or lock it.  If the wireless mode of my treo is shut down, the phone will automatically lock as will it if my sim card is removed.  This program will even lock my SD card.  I think this is a must have for anyone with a PDA phone.  I know there are equivalents for the Blackberry as well.