Open Vector Maps
Openvectormaps.com is a growing library of free, editable vector maps at the city and street level for use in programs like Adobe Illustrator, Inkscape, and Microsoft PowerPoint. The library also includes state/regional level maps using data from naturalearthdata.com. OVM makes it easier for graphic designers, publishers, artists, etc to download pre-made maps for use in web and print projects. Common file types include, AI, SVG, PDF, PPT, JPG, and PNG. Use the requests page if the area you need is missing. Maperitive helps generate most of the maps found on the site in a timely manner.