I just realized again that mIRC is my only communications application that doesn't have a built-in spell checker.
I'm so OCD about spelling things correctly, because IRC trolls are so OCD about picking out people's spelling errors, it really cuts into my time when I have to open a browser window just to google the correct spelling of a word.
This really sucks for someone who types 120 WPM. Very hampering in the exchange of information.