Being the son of two retired high school English teachers I tend to be anal-retentive about mis-spelled words, bad grammar, or any other butchering of the "King's English" in anything that I write. Call it a character flaw if you will. In the past I have always used Micro$oft Word and "Cut & Paste" to try and head that kind of stuff off which can be a bit clunky.

I just stumbled onto a cool little freeware app called ieSpell that once installed allows you to spell check anything that you compose within Internet Explorer. There are three ways to use the app by either selecting the "Tools" menu and then "Check Spelling," or you can right mouse-click in the text box you are composing and select "Check Spelling" (see screenshot below,) or by clicking on the button that is installed in the IE "Standard Buttons" toolbar.

The program is availble to download for FREE (non-commercial use only) at http://www.iespell.com/

Cheers!
Bill