I'm wondering if there is a website that collects (and hopefully updates) information on available web services.
Edit: Thanks for all the info; many good answers. I can only accept 1 as the "accepted answer" at this time, so I picked my favorite one.
How about http://www.programmableweb.com/apis? It has a fairly large list of popular Web Services and a quick info sheet on each, including how to access it.