I would really like to see the vector tiles (ala Google Maps Mobile 5 that was recently released). Preferably without having to use flash as well. Rotating a raster map unfortunately creates problems of its own because text and other details lose some of their fidelity.
Pcbcom, you can try rotating the map using css transforms. I've had some success with this, but it rotates *everything* which might not be desirable. If it's just an unlabeled satellite imagery map with no visible controls it can work nice enough (though in my limited tests a while back I kept having issues where the odd tile wouldn't load for some reason, can't tell you if that's still the case.) The trick would be to hide map using z-level so that it can be squared off (unless it fits by rotating exactly 90 degrees...)
-Steve D