PSP-GPS Receiver Cables for MapThis!
Pc-Mobile now has cables available that are designed to connect the PSP with the Holux GPSlim 236/240 and other portable GPS receivers. Deniska has only confirmed that the cable for the Holux GPSlim 236/240 (GHPSP) works with MapThis! but surely others will work as well. If you're interested in connecting a GPS receiver to your PSP then you should definitely check these cables out for use with MapThis!
PSP GPS Cables @ Pc-MobileVia
Deniska @ DCEmu