Right after Apple released FaceTime for Mac beta, Dieter grabbed his iPhone 4 and called me up on my MacBook. The video above shows the results. It worked well and looked good.
FaceTime for Mac is incredibly barebones right now, almost no UI chrome or options but we'll see what happens come release. The ability to stay in contact, visually, from any iOS or Mac OS device is compelling, but it would be even better if Apple released a Windows version. Let's hope that's coming soon.