I just finished cruising through eBay while checking on general prices for a few things I'm considering getting, and realized that some of what I was seeing didn't quite fit under their category (I didn't "search" for anything, that is).
In a lot (if not most) of the technology categories, there doesn't seem to be any restriction against (or correction of) people listing items in the wrong category. For example, I went looking for a Blu-ray drive for my main computer (specifically, I'm after a reader/writer); stuff that turned up in the listing included:
Complained to eBay, they sent me a generic mealy-mouthed response. Aggravated me, so I went into a different category and reported every single violation I found on the first 20 (of 134) pages. Turned out to be over a hundred items. The last report I sent, I suggested that maybe they were getting the idea of what it was like for buyers...