I would like to see Bing Maps include maps of building complexes (like say a University), any internal roads, building names, it should have street side view from within the complexes, and then even going inside buildings would be cool.
Obviously you would need approval from the property owners for some of these, but that would be really cool.
Then please make it available to your 1st party apps, and via your APIs.
Also one more thing, please do not make it limited to the US. I really hate it when you make a feature (ex. the iOS Bing app) and only release it in the States.