OandA.com has no minimum acct. size and 2 pip spreads on dollar/euro, 3-4 pips for the other majors They don't use lots either. You can trade in any $ amount, meaning there's no disadvantage, trading wise, to having a $100 acct. and a $100,000 acct.
The fact that there's no commission and no acct. minimum makes FX appealing to experiment with, on OandA anyway. They have a free simulator wich is said to be just like the real thing
I've also heard that FX markets are the "trendiest" markets around and perfect for TA.
They trade 24/7, although at certain times, like during the weekends, liquidity drops off a cliff and spreads become huge.
I've looked around and charting is usually expensive. The only programs that can backtest FX, that I know of, are Wealthlab and Tradestation.
This is my my understanding of FX. I've never actually traded it. If i'm wrong about anything, please correct me.