I was working on a Yahoo Pipe last night, and I noticed that Pipes will automatically figure out if you have created a geospatial pipe, and show it on a map without you having to do anything! And to top it off, you can get KML output of your pipe! Now if they drop the old-fashioned W3C Geo point-only format and support real GeoRSS they’ll really have something (hint, hint).
What this means is that you can create and export KML content from Google, Microsoft and Yahoo! now. The mind bubbles at the possibilities…
By the way, if you’re actually interested the content of my Cambridge, MA Happenings pipe and not just the technology, you should know that there are a lot of good events that aren’t getting properly geo-located, so read the feed, not just the map.