The dollar's fall is being orchestrated of course to lower the price of our exports, in order to make us more competitive, AND, in turn, to raise the price of imports and discourage their purchase. It's also going to make a lot of real estate cheaper and more attractive to foreigners. (Speculative inventory will quietly be absorbed.) I don't think the issue of sub-prime holders in trouble was solely the reason for the .50 cut.
I believe even the pros are just a little bit queezy with this one.