It looks like Yahoo! Maps is coming along nicely. They have to reskin it to look a little less like Google Maps though 
Basically, it has all the features of Google, but they’ve released a bunch of APIs to do everything from grabbing custom maps with Ajax to display on your site to integrating maps directly with Flash using Actionscript. There’s way more you can do than with the Google APIs, and you don’t have to get a key just to use it. I’m impressed, Yahoo! 
Yahoo! Maps, Driving Directions, and Traffic
