Here are some sites that you will hopefully find useful:
Perfect English Grammar – an excellent site that covers just about all aspects of English grammar.
Learn English with Ronnie – there is method to this Canadian English teacher’s madness. She’s now produced over 170 YouTube videos on English vocabulary, grammar and pronunciation, all of them in her trademark crazy style. I hope you enjoy them.
BBC Learning English – learn the Queen’s English at a variety of levels with the BBC. You’ll even find some pretty cool videos about pronunciation.