The weekly NDX continuous Chart has a Cluster of TL and 50% Resistance at1635-45.

If the markets can overcome this 1645 area, it would be very bullish longer Term, but for now it is a Brick wall MOB resistance.

The red DTL comes in at the 1645 area and is from the All time High and has been Major Resistance at the 10/31/07 Major High as well as the 6/5 and 8/15/08 Highs.