When I was choosing my current phone (Nokia E66) one of things which I wanted was ability to make video calls. I did not know what for I will use them but why not having them? Especially when they are treated as normal calls by my GSM operator (except roaming).
Some time ago I discovered why video calls are good to have. I have small daughter (~20 months now). When my wife has to travel somewhere (or I have to) we use video calls to wave her on good morning or before going sleep etc. Mira’s reaction is always positive and we usually have to be careful as she wants to keep phone and look at caller’s face.
And so far Nokia failed to implement video calls on N900 device :( So people — fix it or my daughter will force me to take my phone as a backup :D