Funny but I was thinking about some of these things a few months back that you are addressing here but more in the form of an API that allows real time conversion of visitors by geo-targeting traffic for all types of sites.
So say I run a blog and I write a new blog post that happens to mention $1,000,000.00. It would be nice if a reader from Europe ends up on the blog and is reading it would naturally see a conversion appear next that that number in Euro or something to that affect, but not just currency conversion but in the correct format (similar for other metrics since the US seem to be the rarity when it comes to measuring things in Fahrenheit, inches and feet, miles, etc...).
So say I run a blog and I write a new blog post that happens to mention $1,000,000.00. It would be nice if a reader from Europe ends up on the blog and is reading it would naturally see a conversion appear next that that number in Euro or something to that affect, but not just currency conversion but in the correct format (similar for other metrics since the US seem to be the rarity when it comes to measuring things in Fahrenheit, inches and feet, miles, etc...).