I've written a variety of BoardGameGeek tools and toys, some mentioned
here, some mentioned on the BGG forums. I thought it would be useful
to have a single page which lists them. Here it is: Matthew Gray's BGG Tools. It includes the
trade tools, colllection tools, and a "random BGG game" bookmarklet.
There's one more, very neat, addition I'll hopefully be adding soon,
but it may take some time to work out the kinks. Enjoy.
(This is posted under the WebServices category because most, but not
all of the tools use the BGG XML API)