I personally have a ton:
Words I can't spell:
Tomorrow- I don't know why, but I never could quite figure out how to spell that word, I get a lot of comments about it. ... Friend- Confusion and ignorance of the I before E accept after C rule due to previous case

Me too! I tend to forget if the "m" and / or the "r" is doubled in tomorrow or if neither is. I used to have trouble with friend but then I got in to Best Friend necklaces and noticed that on 1/2 of the heart said "Be Fri" and the other one said "St(reet) Ends."
I learned to separate some other words - Me - asure - ment, temper- a - ture
I have a terrible time knowing if words have an "re", "er" (ex. pre vs per).
There is a "lie" in believe.

I am a really bad speller. I always have to look stuff up on google to get the right spelling.

'Friend' used to give me trouble all the time, until one day I started thinking of it as "Fry-End". I even say it that way in my mind when I'm writing it.

Another one that I always mess up is Guard... I always want to put the 'a' first for some reason.

And of course, my favorite... "Bee-Ee-Ay-Yootiful!" (in order to remember how to spell Beautiful... )

I am a really bad speller. I always have to look stuff up on google to get the right spelling.

You're telling us?! I personally think you should have your own personal translator! Oh ILF, it's so easy to mess with ya' on this one. Fish in a barrel.

The one that screws me over all the time is "their"....which sometimes I inadvertantly put as "thier"...in fact even as I look at it I'm not sure which one is the right one, although I think it's "their". Weird, eh?

Half of my spelling mistakes on this forum are due to typos.....

I always get the word receive wrong or anything with ei or ie...but then I remember in grammar school i before e except after c.... !!

"I before E accept after C rule"

There are rules for spelling?! I never knew that. I have just learned the spelling of nearly each new word individually and have not paid any attention to things like that. It may be because of that that I know how to write the words but rarely can pronounce them correctly .

Difficult words:
Yesterday - I keep spelling it with one "a" too many.
Congratulations - need I say why that's a difficult word to spell?
Sketch - now that's a hard one. There's nearly always one "c" too many or it has changed places with "k".

I'm sure there are others, but I can't remember them now . Oh, and the "grey" and "gray" thing... I also have trouble with those. "Grey" is right, isn't it?

Oh, and the "grey" and "gray" thing... I also have trouble with those. "Grey" is right, isn't it?

I believe both ways are correct, one is the American way, the other is the British/Canadian/etc way. As to which is which, that is something I don't know.

Gray is the Americanized version whereas Grey is the Britishized one...I think. I intentionally use Grey because it's fancier looking.

I am really bad at spelling.....
I always spell chief wrong. I spell it like this: cheif
I can never get words with the letters I and E in them right!

Gray is the Americanized version whereas Grey is the Britishized one...I think. I intentionally use Grey because it's fancier looking.

Well, my dictionary says that gray is the American version and grey is the British one. Personally I prefer gray because I think it looks less harsh. The spell checker in Word (set to American English) allows either, but the spell checker in Firefox doesn't like grey.
One of the main reasons I switched to Firefox was that it has a spell checker. Of course I run into problems when I can't get the word close enough to find it in the list.

There are rules for spelling?! I never knew that. I have just learned the spelling of nearly each new word individually and have not paid any attention to things like that.

Very generally rules. I think most of them are broken at sometime or another. I before E except after C or when sounding like A in neighbor or weigh. - then their is science and scientist which doesn't fit at all.
The problem with English is that it is made up of words that originally come from many different languages so the rules that apply to a word with a Germanic root might not have the same rules as a word with a Latin root. Not to mention words that we use in English that are really words from another language - verboten for example.
Typing this up I came up with more problem words: language and originally. I used to have trouble with doesn't - I would spell it "dosen't"

@ Patterwig's Pal: Really? I always thought that grey looked less harsh. Oh well, difference in opinions I guess.
Fun Fact: When I was little I almost always used gray, until I started doing more research on wolves. I must have come across some British authors, and it kind of stuck until I forgot which one was American. (Honestly I do think I like grey better. )

Another word I can't spell: research~ for some reason it always ends up being reaserch. (It was earlier in this post 'till I corrected it. *sigh*)

We use the british spellings in Australia but with my internet use, I always get mixed up.

I can never spell "weird."

I'm an English major, so people expect me to have perfect grammar and spelling, even when speaking (grammar only applies here). People also apologize to me when they use non-words or bad grammar. They say, "Sorry, English major." I think it's ridiculous. Speaking is not supposed to be perfect; it's a way to communicate. As long as you communicate in a way that isn't too much of an inconvenience to the hearer, then you're golden. There are, of course, situations when people ought to spell correctly or not use the word "funner," but those occasions are few. Pet peeves of mine are the "its," "it's," "their," "there," "they're," "your," "you're" words. Not so much the "its," that one's hard.