I am far from perfect in my spelling and grammar but I do try to get it right. (Most of the time, though, I don't even proof read my forum posts so I'm sure I've posted many similar mistakes)

Just thought it was funny that the person posting the "correction" also had it wrong. I always double check with a quick "define cue" Google search before I post, though. LOL

My favorites are:

"could care less" vs. "couldn't care less", and

"Less" vs. "fewer"