Check out the Nasdaq 100 Heatmap. (All of DCI's web applications can be found here.) This is a neat java applet that dynamically updates and gives you a very good idea about the "tone" of the market as it shifts throughout the day. A quick glance at the symbols also tells you which groups are strong or weak. For example, yesterday the biotechs looked weak as a group with IDPH the weakest. You can take in a lot of information with just a glance.

On a day like yesterday where the market gapped up big on the open and then sold off the rest of the day (a classic "gap and crap"), you could watch the Heatmap go from solid bright green in the morning to a paler green as the day wore on and finally ending on a very neutral note.

If the Heatmap were calculated off of the day's open instead of the previous day's close (arguably a more useful way to approach the data from a day trader's perspective) the Heatmap would have gone reddish in no time and gotten redder through the day, ending a very bright red indeed.

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