[exim] Favorite Blacklists Survey

So - just an informal survey of blacklists. What's your most favorite,
semi-favorite, and least favority black lists?

BEST:
Lists that are so good that you can DENY just because they are listed.

GOOD:
Lists that are pretty good buy have a few false positives. Worth a
warning header or greylist but not deny.

BAD:
Lists that are so bad they are useless.