Morgans,
I am in the process of trying to do the same thing. My T43 laptop
should arrive in few days. My plan is use the blue tooth connection for
GPS, XM weather and to use an 8" LCD touchsreen display (Lilliput or
Xenarc) for XMweather and approach plates with moving map.
I only know of two software options for XMweather and moving map on
tabletPC/laptop

1. NAVAirWX
http://www.airgator.com/
http://www.airgator.com/Weather.htm

2. Anywhere XM WX For Windows XP
http://www.anywheremap.com/detail.aspx?ID=93

The discussion board at controlvision is a great place to learn
about hardware/software options
http://forum.anywheremap.com/


Hai Longworth