I'm really excited because I managed to place a couple of SIP calls with my Nokia E61. Quality of sound leaves a lot to be desired if the connection to the Internet is not excellent. I was on an 802.11.b network and I suspect the Internet connection was not that great, so I ended up spending more time asking the people I was calling whether they could hear me than actually speaking to them. Still, I find it great that a personal communication device can be used to place long distance calls via the Internet instead of standard cellular networks... Quality will improve. The question is whether cellular operators will reinvent their business models and how the mobile telco industry will be shaped now that it seems possible to get Internet access in extremely remote places.