A proof-of-concept, displaying geographical information stored in a Google Docs spreadsheet on a Google Map, as described here:
Official Google Maps API Blog: Creating Dynamic Client-side Maps Mashups with Google Spreadsheets
The current version, with a lot more information but without a database or spreadsheet back-end, is on the CBC site.
(Grrr… I gotta change my layout. Curse these narrow fixed-width columns.)