Can't remember where I saw it, but I think someone was asking how to increase membership and/or visitors to this site.

Here's one way — affiliate stickers.

See e.g. http://www.trossenrobotics.com/TrossenRoboticsAffiliates.aspx

I haven't checked out this one, but I have some web sites that are stickered with ads and they do generate a small amount of interest and even a few dollars (and I mean a "few") in the course of 1 y.

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UPDATE 24 Oct 2007:

It turns out Trossen have a "quiet"  policy (i.e. may not be mentioned on the sign-up forms) of not paying affiliate fees for repeat business. So if they knew a customer before you signed up with the program, no use in sending that same customer back to them.