I’ve used Skype a little. A week or two ago I purchased a $10 SkypeOut credit. I’m happy with that service. I’m looking forward to it including 911 emergency service.
Right after I bought the Skypeout credit, I bought three months of SkypeIn service (including a telephone number.) So far, that has been pretty good. I’ve missed some calls and voice mail has been at least a little delayed showing up as as a new event in the Skype console, but overall satisfactory for a Beta product. And a good price too.
Best of all: No hidden phone company fees.