I would expect that 12 industrial countries that gave up their own currencies for the Euro and have a population of ~ 300 M would have similar value to the dollar currency outstanding. At least over the long-term. I'm not surprised by this news; I don't think by itself it is an idicator of weakness of the dollar. (Of course, the dollar has weakened substantially over the last 5 years or so. The initial target was ~ 1 Euro per Dollar, IIRC.)
Dollars Per Euro versus Time:
[image|http://ichart.finance.yahoo.com/5y?eurusd=x|0|Dollars per Euro since 2002|280|510]
As you note, the dollar is still the gorilla in the currency markets and foreign reserves. China by itself has [link|http://news.bbc.co.uk/2/hi/business/6106280.stm|$1 T] in foreign reserves in dollars.
FWIW.
Cheers,
Scott.