Skype's unlimited calling to US and Canadian numbers ends Dec. 31, and they've have the next step: The promotion was ostensibly to see whether people would use the service when price wasn't an issue. Sounds like the numbers came in at the level they wanted. The for-fee version rolls out Jan. 1, when $30 per year or less than $3 per month buys you unlimited calls to the US and Canada from anywhere that Skype operates.
This couples with new Skype Wi-Fi phones and plans, like Belkin's phone that will work with Boingo's aggregated hotspot network. The Belkin/Boingo plan is $8 per month for unlimited use of Boingo hotspots in the US and Canada; there's usually a charge in Boingo's network outside those two countries. The Belkin phone can authenticate with networks encrypted using WEP and WPA/WPA2 Personal, too, for calls on your home network.
Add the under-$3 calling plan, and that's less than $11 per month for a Wi-Fi-only phone that could work remarkably like a cell phone. Quality of calls will be the real issue.