Recent map- and GPS-related questions on Ask MetaFilter (they even come with answers):

• Why haven’t GPS prices dropped as much as other electronics? The consensus seems to be that the GPS electronics cost next to nothing; the price point is being maintained by adding features like colour screens and maps.
• A question near and dear to my heart: the best GPS navigation system for Canada. Garmins were recommended; the original questioner ended up buying the C330, saying, “Of all the manufacturers I looked at, Garmin was the only one that even pretended to include complete Canadian maps with their systems.”
• Meanwhile, a question about showing GIS data in a Google Maps interface — the questioner wondered “if there was anything out there that let you take any old shapefile and throw it onto a Google Map.” Not without more than a few intermediate steps, I think.

Previously: Ask MetaFilter on GPS Data Logging; Ask MetaFilter: GPS for Trip Recording; Follow-ups: Wall Maps and Atlases.