As you can see
HERE, there is now a Suggestion/Mod Crit Post. It is not anon, but it is screened so only the mods can see comments, and is an alternate option to emailing the mods with a problem or something you need.
Aside from it being used for suggestions of improvement, and a modly How's My Driving, it can also be used for player crit. The mods already handle a lot of crit between players, since we consider it out job to make sure everyone uses good grammar and plays ICly, and if you're nervous about giving crit face to face to someone, coming to us is a good second option. We'll handle it all polite-like and allow you anonymity if you choose, while still being able to get specifics from you and follow up after.
A permanent link to the post can be found over in the sidebar under
CONCERNS AND SUGGESTIONS, under the mod email link.
EDIT: It is also a good place to let us know this: "I'm having trouble getting involved/getting CR, HALP." That way we can help you do it and toss stuff your way or toss you at people that also want CR.