Glen Eric Reed - And the "people understand what I'm saying" excuse works great. All other things being equal, however, it makes you appear less intelligent.
this is actually quite an interesting "observation".
it is very human, and initially it makes sence. however, the real point is, what group of people are you speaking for?
the reason i ask is that when i did maths at university (not actually proof of inteligence) it was observed that most (all?) of the maths and physics students had several traits in common:
a) there spelling of english was considered appauling

their grammer was often off the wall
c) hand writing was normally totaly illegible
d) they all had an unnateral fear of essay writing
so, in this group of supposedly inteligent people, a "lateral" approach to spelling was considered normal, and didnt reflect on your perceived inteligence.
now i work with computers, which complicates matters more. i live in england, but the computers normally require american spelling of various "basic" words, including color and centre.
this is just the begining of the fun though. a lot of the code i deal with has been written by other programmers, some of whom have spelling nearly as "interesting" as mine. combine this with the inate lazyness of most programmers (leading to the shortest possible words being used) and leaving out half the letters of some words becomes required english usage
drifting back more torwards my personal take on english, there are a couple of interesting points to bare in mind.
i was quite good at chemistry, even with the lovely long chemical names i had to spell. the thing with them is that they are logicaly structured.
"fixing" my spelling is actually something i have given up, since MS Office 2000 (probably several hundred pounds worth of software) is quite useless at working out what i am trying to spell. i have a 6 year old pocket sized electronic dictionarry (worth about 5 pounds) that does a far better job. its just to slow for regular use.
"english doesnt need fixing" - i like the observation (i forget where i first saw it), an inteligent child goes to school, and the teacher tells the child that enuf is spelt enough. the child concludes that the teacher doesnt know what they are talking about, and ignores then
stepping back from this circular discussion, what is actually ment by "perceived inteligence" anyway? what do you mean by inteligence?