1) When in a thread, with other people. READ what has been written, its a simple idea, but it sometimes doesnt happen, and it means a lot of OOC messages, which clog up the posts
2) Spell Check! There is one in the reply box, hit it, check your spelling, then click on post, either that or you can post it in a word document and check the spelling and grammar there. I'm sure that certain Firefox browsers have a spell check as well. So theres really no excuse.