Having Euro (and Yen and other major currencies) in the Ext distro is a must, IMHO.
I'm +1 so it doesn't feel so American only
I totally agree. But also should currency translations come as a part of the locale translation file. Just as important as having dates translated to a regional format is having the currency format translated.
I guess Violinistas function would cover most currency formats.. It lets you choose your own currency notation, thousand separator and decimal separator. Maybe should you even be able to choose wether the currency notation should come before or after the value...?