Fill in a Mentor Evaluation. - No they don't have to be an assigned mentor, no you don't have to be a newb, just anyone who helped you out with anything. And judging by the incredible amount of evaluations to this point I'd better mention that it takes about 30 seconds to do, help your mentor win a nice big cash prize and a trophy.
And last of all, post in this thread (if you can't post, just chatmail me).
Yes it's that simple, donate to a newb, nominate your mentor and post! The item you donate can even be a whip.
Prize: 50k + some random items (leather, bows etc).
Winner will be chosen sometime in the next couple of days.