Lifehacker's Mind Your Language column tirelessly offers advice on grammar. If you'd prefer your writing advice in video form from a wrestler, we can thoroughly recommend CM Punk's new Grammar Slam series.
Each video follows the same format: CM Punk reads an email from his fanbase/hater pool, and then explains the evident spelling and grammar problems. Clobbering frequently results. There are currently five videos in the series; definitely worth keeping in mind if you need an amusing way to inform a correspondent that they are clueless. Accuracy matters.