Useful app: Internet Explorer spell checker IESpell
IESpell is a free Internet Explorer add-on that lets you spell check text boxes on a Web page. Whenever I write longer text on web pages (blog responses, product reviews, etc.), I generally type into Word first then copy & paste to the browser. The nice thing about this add-on is that I can type directly into the text box and this nifty little add-on does a great job of spell-checking. I tried it on a bunch of different paragraphs and it worked as well or better than any other spell checker.
Bottom line: It works. It takes up very little memory. You can configure it to include your Microsoft Office Spell Checker dictionary file so you don't have to add words to two files. It's free and it’s simple & effective. Click here to download IESpell on Windows Marketplace.
*Special thanks to the Hypercubed Blog for your kind reminder. :)