B1S2 and Michael,
apart from 20 MA which I use as a lagging indicator, I have been using 12 and 4 MA crossovers, they are, IMO, one of the best indicators for short term trading and from what I can see directional swing trading as well. A buy signal on 12 x 4 from above down and Sell signal on 12 x 4 from below to above. I have used it for scalping since the beginning, in my experiences this technique comes very close to a leading indicator, better than RSI, MACD, Stoch for sure as far as timing is concerned. Seems to work on most time frames. It shows an up move for tomorrow on 15 and 60 min charts at the moment, will check in the morning.