One of my 10 predictions at the start of the year was despite the forecasts of most, was the US dollar was going to strengthen against foreign currencies during the year. Well in the last couple weeks the dollar has been on an absolutely impressive tear against almost every currency in the world. The ferocity of this move has simply been amazing, with it moving almost nearly 3% against a basket of currencies in just the last 24 hours. Think of it this way, your dollar in your pocket just got 3% more valuable in the last day, even if it may not seem like it to you.
Basically we're seeing signs of mass liquidations of risky assets (stocks, bonds, commodities, derivatives) around the world and the resulting money is flowing into US dollars, strengthening the dollar against other currencies. While our banking/financial system has it's problems the simple fact of the matter is it's in better shape than many around the world.
The speed at which this move is occurring will likely generate significant effects (problems), but it's very tough to predict in what form they might be. One of the many things that's got my radar up in the last couple days, trying to determine what's likely to happen.

Matt,
It's about time. Our currency has been droping like a lead balloon especially against the Euro. Yes it did bring a lot of investment into the U.S. but I still think this will happen. We are still the safest place for people to invest and they know it.