We have a Stack Overflow and a Math Overflow.
Has anyone thought of setting up a Finance Overflow to discuss derivatives and financial instruments used in banks?
This would be a good Q&A site!
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Besides the answers given
There are currently some money-based sites already...have a look at the listing on https://meta.stackexchange.com/questions/4/list-of-stackexchange-sites, and scroll down to the "Money" section.
EDIT: the page linked above no longer exists.