The latest firmware, build 02.36.03, has an inproved lock feature, using the top power button instead of the touchpad. It should be available via the Sansa Updater soon, but manual installation is a snap.
There is a newer version now available, build 02.37.01, with further refinements. To use the new lock feature, press the top button for about one-half second. Same process for the unlock. The latest build improved performance of the volume buttons when locked (they now work when locked), plus the audiobook / podcast section has been expanded. -microsansa
Being able to click the touchpad on and off makes the player much easier to work with.
Bob 
