Spelling feels more like art than science. Here's a site that shows 100 (actually 250) words that are often misspelled.
It also gives you reasons and memory tricks to get it right.
Not all pens and pencils come with spellcheckers.
The "i-before-e" rule has more exceptions than words it applies to.
Dr. Language has provided a one-stop cure for all your spelling ills. Here are the 100 words most often misspelled ("misspell" is one of them). Each word has a mnemonic pill with it and, if you swallow it, it will help you to remember how to spell the word. Master the orthography of the words on this page and reduce the time you spend searching dictionaries by 50%.