currency microformat efforts
All over the web, we see amounts of money, most usually as prices on eCommerce sites, but also in other contexts - salaries in job offers, fines mentioned in news reports and prices in product reviews, for example.
Wouldn't it be useful to be able to have them converted to your local currency, easily and quickly? Or to see the modern equivalent of an historical figure?
Those are just two of the things which a currency microformat might do for you.
The following is a non-exhaustive lists of microformats which might include an amount of money as a data item:
Work in progress: