Just saw this link on pocketPCthoughts to a program that I think is truly awesome for the x51v.
http://ae.inc.ru/aebplus.php
Under my x50v I was running doubleLauncher and it worked OK, but on my x51v it did not allow for mapping of the left and right softkeys. The AE button plus program (follow the link) does what DoubleLauncher did and more. I love remapping the buttons and the support for single/double/triple/and long press support for each button. Here is how mine is setup and I'd be curious how others use theirs:
Button 1
Single Press: Cascading Start menu (from Wisbar)
Double Press: Switch to today screen
Long Press: Application: Total Commander (free file explorer software)
Button 2
Single Press: Left Soft Key
Double Press: Volume Down
Button 3
Single Press: Right Soft Key
Double Press: Volume Up
Button 4
Single Press: Ok/Close
Double Press: Task List
Long Press: Memory Monitor
Button 5
Single Press: Alarm Note
Button 6
Single Press: Wireless
I am slightly obsessed with one hand operation on the Axim and this program makes it nearly possible.
Tim