I would like to add my support for this suggestion. Ever since Firefox recently added a spellchecker, I have gotten used to it, and it's annoying that mIRC doesn't have one - the absence is noticed.
I've tried to make a DLL based on Aspell, this is no easy task which is why nobody has done it. It's one thing to get the spell checking right, it's another thing to have it underlined with a squiggly red line in the editbox. And then there is the issue of adding a context menu for suggested spelling corrections.
Spell checking is a natural feature for a text centric program. I would encourage khaled, if he is interested (or anyone who is capable of making a DLL), to take a look at Aspell, it's an open source library.
