I'm kind of crazy about spelling and grammar - I shout grammar corrections at the TV mostly about the improper use of I and me - when the speaker should know better (newsreader, program host, etc.). But that's me.
On the board, spelling doesn't bother me although sometimes I have to read a post more than once because the misspelled word really IS a word so the context is totally weird.
Plus my own spelling has become worse since using the computer for writing and sometimes words spelled correctly look weird: e.g. color - shouldn't that have two "l's"?
It's the lack of punctuation or upper/lower case that throws me. I won't read anything that doesn't have punctuation because it just takes too much energy to figure out what the poster means.