There very well could be a large private pool out there that we're unaware of.
It would be helpful to have all the active pools listed in the OP -- a user that might want to compare the available pools in a more informed or systematic way currently has to survey 31 pages of forum.
Also, it might be beyond expectations of what's usually encountered at BTC-talk, but a listing of fees and geographical region of pools (if possible) would be awesome and not that much admin work after the initial steps (assuming that pools don't change their fees charged more than once a week or so). It would take forty-five minutes time tops to gather this information -- I'm not necessarily volunteering for this (but if noone else springs into action or takes point on this I suppose I could). The geographical region is useful to know (or at least hypothesize), of course, to minimize the latency for shares submitted.
Also, just as an observation, I find it endlessly amusing how people pile into the pools with the biggest hashrate (to get an infinitesimal share of the pool's overall mined coins while effectively benefiting others with monster GPU-rigs or rented hash) instead of doing the logical thing and using pools with less hash to potentially earn greater rewards to their own benefit. A more judicious look at the probability of mined coins (also considering the fees of the pools) would probably earn them more BWK if they thought things through. Moreover, mining at pools smaller than the top two or three helps distribute the coin more widely, incentivizing the smaller coinholders instead of subtly encouraging people to be a bunch of sheeple/bandwagon-hoppers and enriching predominantly the operators of the favored top two or three pools and the larger miners).
Speaking as a pool admin, please follow this advice. Too much concentration of hashing power on a single pool is not good for any coin.
If a single pool ends up with more than 50% of the network hashing rate it can unintentionally create a soft fork which is specific to the pool and invalid everywhere else. Anyone mining that fork will find themselves without any valid/useful rewards.