Sorry, but I believe you are incorrect... Publication 525 specifically states that profits from foreign currency exchanges exceeding $200 based on changes in exchange rates is to be claimed as capital gains, not ordinary income:

Foreign currency transactions. If you have
a gain on a personal foreign currency transac
-tion because of changes in exchange rates,
you do not have to include that gain in your
income unless it is more than $200. If the gain
is more than $200, report it as a capital gain.

Page 33 : http://www.irs.gov/pub/irs-pdf/p525.pdf