Here is a quote from the help files, to help decide if you want to enable HTML in the forums... based on this, I chose not to enable it...
"By allowing HTML you are opening up a whole big can of worms. You may wish to allow HTML in a controlled INTRANET environment,though. It is not recommended to be used on the INTERNET as anyone can post anything without your being able to screen it. IE Pornographic pictures, JavaScript that messes up your pages, etc... " Bill