I find that some handheld devices have "plenty" of security.

For instance:

I have a palm T3. It doesn't have an internet connection (yet... I'm still waiting for SanDisk to release drivers.. gRRRR!). It does have bluetooth though. But, you must allow the connection. You and the person connecting must know the "key". Both users enter the key, then then they are connected. The sender has to initiate transfer. The receiver can not. Bluetooth doesn't communicate very far though... 30ft... You can also see on the front of the screen when it is in use. It doesn't work when the device is "sleeping". After 3min, it will autolock itself and encrypt everything in the internal memory. (64MB).

My T3 also has encryption. When it locks out, it encrypts everything I tell it to. I believe I have it set on blowfish? If I enter the password wrong 3 times, it will reset the device to factory and erase everything on it. I've done it on accident...

If you try to hotsync, it'll prompt you for the password. Enter password wrong 3 times... data is gone. (still on main PC though. So, next legitimate hotsync will restore databases/files/programs).

Just make sure not to store any important data on the SD cards... that can be removed and put into another device. The only thing I put on there is music(mp3s) and pictures.

Oh, it even has free antivirus!
http://www.bitdefender.com/bd/site/p...s.php?p_id=23#

It will only scan palm files though. If virus for another system is on it... it won't be detected...