How do you map out a 1 hour driving radius from your city?

I am trying to find a way to map out a 1 hour distance from my home and find the zip codes in those areas.How do you map out a 1 hour driving radius from your city?
I always use yahoo mapsHow do you map out a 1 hour driving radius from your city?
There is an online service that will generate a "drive time radius map". There is a fee starting at about $70 and up for the service which is dependent on the size of the map and how you want it provided to you, ie. .PDF format or on paper. They can deliver your custom map if you do not choose a PDF map via FedEx in larger sizes. They also offer laminating services. Here is the website: http://www.marketmaps.com/products/drivetime-all.asp?