SpellingCow

I ran across this yesterday as I was reading up on COWS Ajax. It's a spellcheck component that you can implement on your website simply by copying a few lines of JavaScript. It's really easy to wire it up to your existing pages and the UI of the tool is very intuitive. Visit the home page to test how it works. www.spellingcow.com

I had a few issues with the "favelet" on IE. Couldn't get it to work well but that aside, the tool works pretty well.

SpellingCow can spell check as you type on any web page. Just add one line and your website will have the best spell checker on the net! You may also run SpellingCow on any website you visit via the use of a favelet.