It will be better if you say what you need from it (grammar, vocabulary etc and on which language you want it) this one on english http://www.masterrussian.com/ there are some interesting ones on russian http://www.gramota.ru/ http://www.gramma.ru/ http://deb.telenet.ru/know/grammar.shtml

I agree with mister ngl - what this bad?

what this bad?