I've been playing with Sketchup since before Google buyed it, but I haven't done anything great. I want to make my future house floorplan in 3D, but as usual time is precious, so I'm always delaying it.
Anyway, for those wanting to transform buildings into 3D, you should check this video... just amazing what can be done with a photo and 3 minutes! (I didn't know I could load a photo to use it as reference, cool idea)
Note: Now that I finally have my new (and fantastic) HTC Touch with Windows Mobile 6, I'm playing a bit with the .NET Compact Framework to make a small tool I need, so expect soon one or two posts about development with .NET and PocketPC ;)