For those of you with Pocket PCs. This is a little freeware gem, built with cockpit use (ie finger not stylus) in mind.
* Does everything a whiz wheel can do.
* Great User Interface
* Holds the calculated answers for use elsewhere, which is a real timesaver.
* Useful timer feature
Only issue is that it doesn't hold Imperial Gallons as a volume measure.
http://www.seattleavionics.com/flightcalc.shtml