Hmm. Most of the accounts I've tried failed logins. Some even failed front-end validation (password is required to be 8 characters, but the dump gave less).
If anyone gets better success, let me know. Otherwise, I'm calling this one a dud. =|
woot! juicy
EDIT: For others, this is an email:password list with 500k rows. Too bad there's no source reference (like where they can be used), but still good resource!