I'm going to be honest: an app called TinySpell was recommended to me recently, but got rejected when I pitched it to TSS. I think it's awesome, but you can't always convince the masses. TinySpell sits happily in your system tray and as long as you're using it, you have no excuse not to spell correctly (even in Notepad)! As long as message boards exist, this app should thrive. Oh, and it's free.