Commonly misspelled words

This site points out some, well, as my title suggests, commonly misspelled words. I'm a pretty good speller (despite losing my fifth grade spelling bee competition on the word 'rambunctious') so maybe I'm not a good gauge (on the list) of misspellings but I would say that maybe only 1 or 2 on the list has ever given me trouble. Is 'library' that difficult to spell? (I do like the tip that tells you not to forget to pronounce the first 'r'). Or 'weather'? (via)