I know I'm sinfully guilty of constantly misspelling 'The'. Just how my fingers run, it becomes Teh. Its more common than you'd think.
while not a misspelling more than just shit lazy stupidity, is the textspeak. I'm sorry, you're on the computer with a full sized keyboard, you can take the extra keystroke and spell out the word 'to' instead of using '2' and perhaps not look like a complete and total jack off.