Use ru.lesswrong.com if possible, or just create brand new eye-catching phrase in Russian, which will not be translation of "less wrong", because correct translation of this phrase will be long and counter-intuitive. For example: be-rational.ru, usebrain.su, мысли-правильно.рф (think correctly), напряги-мозги.рф (get smart), мозгоштурм.рф (brain storming) etc.

P.S. I have found http://lesswrong.ru/ at Translations list page, so let's use it.