Brian over at Copyblogger has another great post on grammar errors to avoid:

It?s time once again to review those nasty errors that damage our credibility when we write. Not normally a fun task, but absolutely necessary. I promise to keep you amused to diminish the pain (or at least I?ll give it a shot).

As with the last time we explored grammatical errors, I feel compelled to mention that copywriting and blogging should be conversational and engaging, and breaking formal grammatical and spelling conventions can often be a good thing. Every time I see a comment complaining about something like, oh, I don?t know? the improper use of an ellipsis or one-sentence paragraphs, I shake my head with sadness. Source: Do You Make These Mistakes When You Write? | Copyblogger

Sure, blogging is supposed to be less formal than other forms of communication, and Lord knows Jim and I make enough mistakes ourselves, but when you’re blogging for your business you do need to take some extra care and proofread your posts–spell check too!–before hitting that magic “Publish” button.

Oh and if you do find and error later, just go back and edit the post.  I’m sure no one noticed.