Hi breadman
you could either trade with retail spot forex dealers like - oanda, fxcm, acm, cms, gft, rjofx, forex.com, gain capital - who all act as marketmakers, and many allow you to trade 24/7 - albeit with wider spreads on a weekend.
You could trade spot forex directly through the interbank market with a direct access forex trading service like IDEALPRO from interactive brokers (i think this fits into that category), hotspotfx etc. Or, you could trade these currency pairs through CME globex futures with brokers such as interactive brokers or tradestation. Not sure whether these products are tradeable on a full 24-hour basis though.
Regards
jtrader.