Free

Geo layers and shapefiles of highways and railways of North America.

"Map Channels is a service that lets you embed a custom map into your website or blog without the need for coding."

You can geocode a single location or a lot of locations. Geocoding is a translation from an address to a coordinate system.

CRIMESTAT is a program that interaces with ArcGIS and other desktop programs. The program itself conducts geostatistical analysis using crime and incident locations and times. The program is used widely across the nation for spatial analysis.

One of the best websites out there for tips and tools for DIY map making!