You've been able to paste a KML file straight in to Google Maps for a while, as of today, Google Maps for Mobiles supports this too. Sweet.

services.google.com/marketing/ ...

Should work really well if you want an easily accessible list of locations straight on your mobile. I'm think intineries for holidays would be a perfect example, or possibly an online treasure map application that people play on their mobiles...

And there are many videos about that :)
video.google.com/videoplay?doc ...
click on the link "from user" ;-)

google.com/trekfan
[via Google Maps Mania googlemapsmania.blogspot.com/2 ...]

note : KML there is used just for addresses. You can't see 3D Buildings or layers