the futures are very liquid, I trade euro dollar and yen dollar on TT on cme. Generally 100-200 at the market each side for five prices (visible) each way. Thins out 5,10,15s before something like trade deficit but good to trade off market stop orders to get you in on these, if you like a little risk and have a fast trigger finger! :eek:
If you fancy longer term cmc spreadbet have 3 pip spread on the cash fx and if you're a brit it's tax free profits. Their charting software is even starting to resemble cqg