Skype now offers free calls to land lines in US/Canada - more details here.
If you’re in the US or Canada, you can use SkypeOut to call any landline or mobile number in both the USA and Canada for free.If you’re in the US or Canada and calling any other country, OR if you’re in any other country and calling landline or mobile numbers in the US or Canada, the standard SkypeOut rates apply.
Of course, Skype-to-Skype calls continue to be globally free, so no changes there.