[onree]

Yeah, I'm having the same problem. There's a registry key -- DeviceLockWhenSuspend -- that used to work but ever since I've stopped using HTC Sense/CHT it no longer does anything. (So -- if you want to put CHT on your phone, that's one way.)

I don't want to install any additional software if I can help it. So I guess my options are: 1) password protect the lock screen; or 2) map the top power button to Lock.exe and try to develop the habit of turning my phone off. Of those, I'm going to try #2 first.

Hopefully, someone will come up with a much better set of options!