Needs something like this for the US...

Here in Germany, there are a lot of prefixes you can dial to get cheaper long distance. They fluctuate a lot, so some people don't use them. But there is a website my wife found a while back that shows you, up to the minute, which one is cheapest for where you want to call.
www.billiger-telefonieren.de
Literally, cheaper-calling.
It's pretty cool. Now we need something like this for the US, so I can use it while there visiting family. It's funny though. It's cheaper for me to call the US than for me to call Austria, which shares a border with Germany. WAAAAY cheaper. Like 1 cent versus 11 cents per minute.