You've got to check this one out. The Amgen Tour of California kicked off this week, and you can monitor race progress using a Flex app that combines Flex, Flex Data Services, Flash Media Server, and GPS equipped bikes. This is definitely one of the coolest Flex apps I have seen to date, and it was built in 4 weeks! Details in the press release and on Mike Potter's blog post.
Was this done with the Yahoo! Maps API?
Anyway, thanks for posting it.