It's a long race with a lot of stops, so here's an easy way to refer back to the trail map.  And a simple click on the map will take you right to the Iditarod's main trail page with more details.
 

And for all those ubber detail-oriented folks out there, we've backed into a more detailed key of checkpoint mileage.  I wouldn't bet any money on the figures in this spreadsheet, but they are mathematically calculated from the basic mileage parameters given by the ITC.