Laidi's book is a good read:
http://www.amazon.com/Currency-Trading-Intermarket-Analysis-Shifting/dp/0470226234/ref=sr_1_1_title_1_h?s=books&ie=UTF8&qid=1288836122&sr=1-1
thanks for your input. i like their platform design, very simple and straightforward. i am not a day-trader so i am less concerned abt intraday fluctuations, as long as they settle the right prices at the close.