Here's one: get newlines working. Either allow <br /> elements or translate the newline before applying the comment. It'll make the comments a lot more readable. I know it can be abused, but I don't think that's really a worry in this forum. You can always turn it back off later, right?
>>jwecke+(OP)
Nitpick. I noticed this is working now when you type two newlines, but when it's just one newline it translates into a space. I'm probably the only one who cares though...