Just ran across Babble which offers a similar package as Skype. Free calls to landlines from your computer. However, they are slightly different. Your free account gives you 30 minutes per day of calls for the next 90 days, but you can only call certain countries.
The list includes many European countries and the US, Canada and some South American countries (click here for the full list)
But, they are offering a really neat feature. You can signup for a Babblestick. For $35 you get a 256Mb USB stick and headphones. You insert it into any USB port and can then make VoIP calls from that computer. Meaning, you could call from a coffee house with the Babblestick without having to download any software.