Did a search of "spelling checkers", and didn't see anything listed. So I thought these links might be handy for some people. Handy plugins for anyone who uses forums.
Spelling checker for Mozilla Firefox - http://www.mozilla.org
SpellBound - http://spellbound.sourceforge.net/
Spelling checkers for Opera - http://www.opera.com
GNU Aspell - http://aspell.sourceforge.net/
Win32 version - http://aspell.net/win32
Spelling checkers for IE (Bad choice of a browser!)
iespell - http://www.iespell.com/
Theres also a universal application, that does spell checking as you type.
http://www.asutype.com
It works in all web browsers: IE, FireFox, Opera, NetCaptor etc.