Is there a shortcut to

Locking the handheld?

Posted from my CrackBerry at wapforums.crackberry.com

Disable dialing from the home screen in the Phone Options, then use the "K" to lock the keypad.

Hold the Mute/Suspend button on top for a few seconds to suspend the BB.

Use a magnetic holster.

Or if you do not want to disable the dialing form the home screen function...press the alt and enter key at the same time.

for me a better way is via AutoLock, get it at geekandproud.net/blackberry-software/