I started off using Oziexplorer for PC/notebook. Its a great program, easy to use. I scan all my paper chart to jpg format and use it straight on the Oziexplorer. Notebook is cumbersome to use in cockpit so I converted to using OziexplorerCE on an iPaq PDA. Just clip the PDA to the steering pedestial hand-hold. Works wonderfully well. All I need do is get hold of a chart, scan it to jpg (large chart scan can be stitch together), convert to ozf format, calibrate using the PC version and use on iPaq.
The Official OziExplorer Web Site - GPS Mapping Software for Magellan, Garmin, Lowrance, Eagle, MLR Receivers