Any in particular that you guys can think of? This would be a good way to forecast movements of certain currenies by basing it on the US market's performance.
Check out the Daily Fx website and open a demo account on Fxcm to watch a few pairs. Kathy Lien's book is also a good intro to Fx. The past few weeks has seen strength in the USD as the equities market has sold off, and is not always the case. http://www.dailyfx.com/ el surdo
Today the 5 minute GBP/JPY lined up nicely with a 2 minute YM almost "bar for bar" at times. The key pair to watch right now is USD/ JPY... If GBP/JPY is about to spill over and the DOW is down be sure to check USD/JPY. If they are all breaking support the DOW and S&P will lead the way. An uptrend is a bit different, watch for a bigger retracement in the pound and after hours is a different story...