tinySpell - checks your
spelling in any applicationWebsite - Download - Quote from the website
Occasionally you need to check the spelling of words in an application that does not include a spelling checker and you don't want to launch your word processor just for that. This is when tinySpell becomes handy. It is a small utility that allows you to easily and quickly check the spelling of words in any Windows application. tinySpell monitors your typing on the fly and alerts you whenever it detects a misspelled word. It also checks the spelling of every word you copy to the clipboard.
tinySpell installs itself in the system tray for easy access. It comes with an American-English dictionary containing more than 110,000 words.