current:
copilot 8 (laptop version) http://www.alk.com/copilot/
-live tracking if you have internet
delorme street atlas 2006 http://www.delorme.com/software.htm
-add your own routable roads
microsoft streets & trips 2006 http://www.microsoft.com/streets/default.mspx
-can be had for $25 or less retail
iNav iGuidance 2.1.1 http://www.inavcorp.com/products/iguidance21.html
-best simple interface (highly praised for us carputer use,europe now available)
mehere http://mehere.glenmurphy.com/
-free, requires internet, uses google maps, useful for vehicle tracking

hope these help