Here is a great FREE ADD-ON for users of Microsoft Internet Explorer called IESpell - it easily installs and adds itself to the tool bar for easy spell checking. I was given this addy from a member of another forum where people are notorious for poor spelling and I'm always looking to improve my own work usage.
http://www.download.com/3120-20_4-0.html?qt=ieSpell&tg=dl-2001&search.x=17&search.y=6&search=+Go%21+ - it is about 2.4 megs in size, allows you to add words to your dictionary and give your accurate possible words to choose from when you closely spelled a word, but was just off by a hair!
Give it a try if you'd like, I know it will come in handy in the forum and in nearly EVERY application that you can think of where writing is used on your end. Hope you like it. I'll also post it in the software section.