I am starting to trade the SPY intraday and I was looking at a bunch of posts about spreads being .15, talking about trading intraday with SPY is useless....however I was a bit confused b/c I have been backtesting the past year and it seems like a great intraday trading vehicle. as to the spreads, I don't see these huge spreads some people were talking about....but these posts were posted around 8/02 - 9/02....interestingly enough, i came across this chart of the SPY....and I'm curious, what happened? It seems that the volume jumped from an average of 30 million shares to 50 million and up. I couldn't be the SEC thing with ISLD, was it? I don't see how that would cause the volume to jump so much. anywhoo, some advice from SPY or QQQ traders would be great. I'm still not sure whether to trade SPY or QQQ but I think my strategy should work well on both.