I use NavBox pro and find it quick and easy. Does your PLOG for the kneeboard, prints out your frequencies, weight and balance, fuel burn, flight plan. Will also upload to your GPS if it's Garmin.
Although I have a Garmin 12XL I tend to use a Magellan 315 because it holds a lot more waypoints so I don't use the upload.
Spoke to NavBox at the PFA Rally to ask about possible Magellan interface and got the impression that the next development was probably going to be to do it all on an Ipaq so you get GPS, colour moving map and flight planning all in one hit in a pocket unit that you can carry in your flight bag, clip on the panel and claim as a business expense!
GPS/Moving map is already on the Ipaq and seems to have reached us via the gliding fraternity - looks good.
I for one would be interested in comments from users.
Mike
The Ipaq