Here's another chance to urge you all to switch to using Firefox instead of Internet Explorer!
Visit getfirefox.com and download it free of charge. Of the many great features, one newly added is the spell check. When you're typing into the message box here (or on any website), Firefox checks your spelling as you type, and underlines any words it doesn't recognise in red. You can then right-click them and get a list of suggested spellings.
Give it a try!