Yahoo released the beta of their next generation maps and it's pretty slick. The maps are cleaner and it sports a lot of nice modern features, but I'm mixed about the use of Flash to build it. However, at the same time, Yahoo also release their maps API and it supports both Flash and AJAX and I've seen some of the AJAX stuff which is very nice.
For some more details, the Y! Search team's blog also talks about the release of the new maps and APIs.