Openstreetmap
I could ramble on about the Ordnance Survey, but others have been there before me. Instead, I’ll just point you at:
“OpenStreetMap is a project aimed squarely at creating and providing free geographic data such as street maps to anyone who wants them. The project was started because most maps you think of as free actually have legal or technical restrictions on their use, holding back people from using them in creative, productive or unexpected ways.”
If you’ve been following the recent posts on the new bike and the Garmin Edge, then you’ll be able to see what’s coming. I’m planning on donating all my routes to the wiki as a socially-responsible thing to do 
It’s also a good excuse to get out on the bike more…
Tags: creative commons, Cycling, free, garmin, gps, mapping, openstreetmap