Today I came across a very nice free service called Ring-2-Skype. It lets you register a personal international number from about 40 countries, and whoever calls this number and dials your extension is directed to your Skype account.
The coolest thing is that you can register a number on several countries for the same Skype account. For instance on for USA, one for Peru etc.
And… it's FREE!
The downside is that the number you get is not direct, but requires you to dial an extension number, so you can't use it with Google Voice-like services.
UPDATE #1: I discovered a bug with the service - it is incompatible with Skype's voicemail: meaning the call gets disconnected when the greeting is played. I contacted them and they said it's a known issue and they are taking care of it. I'll update the post again once I know this issue is resolved