Tony Hirst has a wonderful post on his blog showing a mashup between Wikipedia, Google Documents, Yahoo! Pipes and Yahoo!/Google maps:
"So to recap, we have scraped some data from a Wikipedia page into a Google spreadsheet using the =importHTML formula, published a handful of rows from the table as CSV, consumed the CSV in a Yahoo pipe and created a geocoded KML feed from it, and them displayed it in a Yahoo map."
I highly recommend checking it out as it gives a good overview of some of the infrastructure Yahoo! and Google are making available to all of us. Here is the end result.