My favorite spell checker for my Internet Explorer browser is called ieSpell and it’s available for free. I have installed it on all the computers I use. I use it on Facebook, LinkedIn, YouTube, and the forums; anyplace you have a text box you can right-click and check your spelling. Here’s their spiel:
ieSpell is a free Internet Explorer browser extension that spell checks text input boxes on a webpage. It should come in particularly handy for users who do a lot of web-based text entry (e.g. web mails, forums, blogs, diaries). Even if your web application already includes spell checking functionality, you might still want to install this utility because it is definitely much faster than a server-side solution. Plus you get to store and use your personal word list across all your applications, instead of maintaining separate ones on each application.
The program installs as a new button in the IE toolbar (as well as a new menu item under "Tools") – after filling in a form, just hit the ieSpell button and it pops up a dialog, similar to the MS Word spell check. ieSpell also works (right-click menu only) on other IE based browsers such as SlimBrowser, CrazyBrowser, MSN, MyIE, etc.
ieSpell is not spyware or adware. It’s free for personal use only.
I am amazed that a lot more people don’t use or even know about this helper for the many of us who are spelling-impaired. Cheers.