"It takes all the running you can do, to keep in the same place."
BBH posters I notice are given a suit and a rank, corresponding to playing cards.
The suit indicates both the 'quality' of your posting and your encouragement of posting by others. If you are starting threads that get many replies, and/or your posts are exceedingly entertaining then you will be a higher suit.
Suits are defined thusly:
Heart - Great
Diamond - Good
Club - Mediocre
Spade - Poor
Your rank is related to the extent of your participation in BBH, your maintenance of character and stylishness, along with any other factors I feel like ranking by at the time. Ace is the lowest rank, and king is the highest. Its easier to get a higher rank in the lower suits, so try not to be too excited if you are jack of spades.
If you manage to attain a royal rank (jack/queen/king), you will (probably) have a personalised card drawn up and will be included in the Hall of Fame on future ranking posts.
Will probably do the first rating in a day/two.