The folks at GeeksToGo.com posted a nice indepth review for Streets & Trips 2008 with GPS.
They gave it 4 1/2 stars and stamped it as "Geek Approved" and summed it up by saying:
"Overall Microsoft Streets and Trips 2008 with GPS Locator is well worth the money I paid for it. It’s simple to use, accurate, full of features, and reliable. If you are like me and you are going to take your laptop with you anyway, you might as well save the money and purchase this GPS versus going out and buying another piece of hardware."
Check out Geekstogo.com
Streets & Trips Team Blog 