I got directed to the Mudcat links page with a recent post, too, but I find I have to agree with Guest that it's gotten so bulky as to be pretty hard to navigate. Too many categories and maybe haphazardly applied... don't know what the fix would be after the fact, though, without lots of labor on someone's part. Perhaps some good keywords whenever an entry is added, then one can search? (It does mean you need more than just the URL, and more than just the site name to go with the URL, which is useful anyway.)

~ Becky in Tucson