Skype released the final versions of its software for the Macintosh and Linux platforms. I use SkypeOut for calling Europe, and it is great.
You can call PC-to-PC for free, but PC-to-Phone costs money. I spend about 5 U.S. cents per minute. Its much better then using a cell phone and calling cards that is for sure. I think calling cards were costing me about 10-15 U.S. cents per minute.
All you need is:
- Credit Card
- Broadband connection
- Computer with sound card.
- Good pair of headphone w/microphone
Be forewarned that calling a mobile phone in Europe is about 10x more expensive then calling a regular phone line.