Here's a chart you'll probably find interesting. As you can see, the major indices have all posted similar gains in the past month. But starting on November 19th, small-caps and micro-caps started to accelerate.
This is probably the start of the Santa Claus rally, which, like Mall Christmas decorations, seems to come earlier every year. And what comes next? The January Effect! I recently wrote an article about that for the Free Market Cafe's Daily Grind. You can read that HERE.
See also: The current market rally is well below average in both duration and magnitude. Via Chart of the Day