Skype-in is a service that allows using ordinary telephone numbers – of the countries where the service is available- for a 30 euro per year fee. Any person wanting to contact you from the same country where you bought a Sype In number will be able to phone your computer from his ordinary phone or mobile phone for the cost of a local call (of the area where you bought the telephone number).

What are the advantages? An NGO in Italy can buy a USA telephone number and its collaborators there can call their headquarter for the price of a local call.

More info: http://www.skype.com/products/skypein