OneEighth

1 Targus AC/Car Adapter $99 (For sony and others)
1 Laptop (already own)
1 Earthmate/USB Combo 169, with Ecodes from AW member, thank you very much, saved ~15-20bux
1 Lighter power splitter, had lying around
1 Streets 9.0 software
1 Free Copy of Winamp
1 Old Cd player connector from Sony's Kit

I setup my Earthmate on the dash, usb powers the GPS off the laptop, the laptop is powered off the targus.

The sound was weak, so remember I had a Sony Cassete adapter, and I figured it could run the laptop sound, walla it did.

So now I have an endless MP3 Player with decent sound off the symphony cassette, while street Atlas reads me directions..

now all I need is some way to cut out the winamp sound when the street atlast reads out directions..