Anyone used this service yet?

voipshunt.com  

ie vo(ice)IP shunt.  You pay ?12,50, you can try before you buy.  You get 4 months of 300 minutes a day to (for instance) UK, USA, for 5 centimos connection fee and nothing more.

I am well pleased, able to call family and business connections without counting the cost. 

Of course broadband is a prerequisite - translation of that last word = needed to start with

Enjoy.