Here is one link with a bunch of pictures of heat sinks. http://images.search.yahoo.com/searc...l&va=heat+sink
There are lots of other types as well. As said above they should be considered extruded aluminum. It does take a good bunch of them to really add up, but it typically pays a little bit more than standard aluminum such as siding and such. Many cheap boards have lots of small thin ones on them. I have been getting some pretty hefty ones from computers lately. Some weigh in at several ounces each.
Also as said above. run a magnet around them. If ripped from a board, there are typically some steel pins that are friction fit (wedged in) to hold them on. They can be removed fairly easily with a good pair of dykes (side cutters) by grabbing and leveraging them out. You want them completely free of these or screws to get full price.
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