We all do that and after a few hours of reading and posting, we all get very fluent in chat typo.
You may want to check out ieSpell if you use Internet Explorer. I'm sure there's a similar plug-in for Firefox and other browsers.
I understand your point, but I agree with spendnfast. Case in point... I just made a post and have a typo in the title line.... Oh... to be able to go back and correct it!
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