$129
www.microsoft.com

GPS systems that help you navigate from door to door are selling strongly this year, according to Steve Baker of market research firm NPD Group. Most of the portable devices in this category run around $500.

But if you can't afford that, Enderle suggests Microsoft Streets and Trips 2007 for your laptop as an alternative.

The software comes with a GPS receiver you connect through your computer's USB port. The tool announces step-by-step directions as you drive and also allows you to track your route in real-time.