I've been going through the image tags to clean them up a bit (fix typos, fix misspellings, split tags where people forgot commas, etc).
I've noticed a few tags that when I click them, it doesn't actually have an associated image with it, even though this page says it does:
http://www.dakkadakka.com/core/gallery-tags.jsp
For example:
Eldar.
That's the word Eldar followed by a period. The page says there's 1 image with that tag, but it can't be found.