Fox asked me the other night if there was a way I could put up a poll/rating thing to comment on those that we PUG with. Unfortunately, not really but you're all welcome to create a Wiki entry which you can all contribute to and edit.

Also, there is Zarkmark. Check it out!

Drejammer and Magencia, both of THE SANDBOX.

Drejammer runs a weekly 25-man TotC Pug (he actually runs 3, on three different toons, but I've only been with him as Dre) This guy is a trip. He is hilarious on vent. The most organized, but fair, PUG leader I've run with. He also is meticulous about making sure he gets (mostly) quality players in his groups- we one-shotted through the whole instance twice, and on the third run we struggled on Anub because some people dropped.

Magencia runs fairly regular 25-man Ony runs and he sounds like a crusty old guy ala Slowman. Also well organized but laid back.

I recommend both these guys' groups if you are looking to PUG 25 man content.