Hello All,
I've just switched over at least part time to using the new Firefox 2.0 web browser. Of the benefits is that it automatically checks your spelling as you're entering text into a web form, like those used for posting messages here. There will be a little red underline under words you've misspelled, and a right-click will bring up suggested alternates to select from.
If you wish you had a spell checker here, I recommend trying out Firefox. It doesn't replace your current browser and it installs in seconds. So far I'm pretty happy with it.
http://www.mozilla.com/en-US/firefox/