My previous comments on COT reports are here :
http://www.trade2win.com/boards/showpost.php?p=76861&postcount=5
In the context of this current thread I would add that it is still possible to use the COT reports for long term trading currencies, although my warning to Seancass would have been not to try to pick the highs & lows vs the $, simply because the extremes in the COT positions can persist for quite some time. For example just because the Comm positions are at a 5 year record extreme of say 100k long, 9k short doesnt mean that you don't still have another 3 months or more to sit it out before a further extreme of 120k long, 6k short, and the price bottom is finally reached.
Far better IMO simply to take COT positions for the 5 major currencies - EUR, GBP, CHF, AUD, JPY vs the $, (not CAD, MP, NZD), try to find 2 that show fairly opposite extremes, and trade one against the other rather than outright against the $. In other words you are looking for one pair where the Comms are very long with negligible shorts, and another pair that shows the opposite. If the COT situation is not extreme and clear cut, don't trade ! But, you'll need plenty of patience to sit it out week after week, you'll have to do your own work re stops and targets, and don't expect perfection !
For currencies use the futures only reports. Also remember that the COT reports deal with futures, so if you are trading via a spot broker make sure that your prices correspond correctly, as futures are sometimes quoted round the other way.
Good luck and safe trading !
rog1111