Anyone use this? I have just installed it and the potential seems huge if you can get some mates to install it too. You could cut your tariff in half potentially - The only reason I discovered it is because I have to make a longish phonecall to the Netherlands over the weekend and now I can do it for free: N95 > 3G data plan > Fring > Skype. 
More info here: http://www.fring.com/

More info here: http://www.fring.com/
...great little program.
. It seems to load up fine, then hangs on the 'logging in' screen, but won't leg me in.....Any ideas?