I am probably guilty of getting them mixed up myself! While reading this thread, I kept on mispronouncing "lose" and "loose" and getting them mixed up! I also tend to mix up the "its" and "it's".

But I agree, bad grammar and spelling is a pet peeve of mine. I may not have perfect spelling, but I do try to make my paragraphs legible. (for lack of better word. I can't quite think of a word that means "easy to read" other than legible. XD) I am part of MANY other forums, and it just bugs me to no end when I see somebody "tlk liek dis". Most of the time, I PM them and ask them to proofread their posts or something. And it's kind of sad when they respond "But I'm only 14! I'm not good at spelling" or something of the like. *sigh* What is this world coming to, as far as good grammar and spelling goes.