Knoll Unmult is the original free After Effects plug-in for removing black backgrounds and generating mattes, and is now available for CS3, CS4, and CS5.
A similar filter shipped with AE CS5, but doesn't get installed by default; see Unmult for CS5: Pixel Bender 'Alpha from Max Color' for background on that Pixel Bender and how to do-it-yourself with channel filters. Here's a 3-minute excerpt from a recent tutorial that explains what Knoll Unmult does and how it works:
How to use the FREE plug-in Knoll Unmult, from Red Giant Software on Vimeo.
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