We are trading near 4100 after the market traded higher yesterday, and liked the higher prices.
Big boulder today is that it's Memorial day weekend, and I would imagine that the fat cats on Wall St. will likely head out for the holiday weekend early. The expectation for days like these is that the volume dies out in the middle of the day and the market becomes very slow and non-directional.
I personally think (please make your own ideas) that the 4100 area will act as resistance above, and the market will "fall back in" to the middle distribution by the afternoon.