A few years ago I saw a documentary on learning disabilities, (Nature of Things maybe? Anyone else see it?) and in talking about dyslexia they brought up research that indicated it mainly occurs in people with above average intelligence.
Between dyslexic friends and co-workers for whom english is a second language, I see a lot of strange looking email. But it's often easily understood with a bit of practice. Heck, some of the people I've worked with in the past I couldn't understand at all in conversation, but their English was perfect in writing.
As long as we're all talking sense, and can understand each other, our idiosyncrasies can be overlooked