At least, I think that's what the "Something smells rotten" error is supposed to mean.
I just registered for Delicious to try this out, as apparently my old account didn't survive the acquisition, so I know my username and password are valid.
Thoughts?
https://twitter.com/#!/egebhardt/status/176776297106771968
Are you still getting that error?
Logged out of delicious, logged back in to verify the credentials. Restarted the browser and tried again -- same error.
On the upside, it's easily one of the best login screens I've seen, and the error animation is quite nice. :-)