I find it interesting how often people incorrectly use "then" and "than." I've seen and heard erroneous sentences like: "I'd rather do this then that." "Then" and "than" have completely different meanings. "Then" is used when talking about time or sequence. "Than" is used when comparing things. Correct Sentences: Jack Russell Terriers are more hyperactive than most types of dogs. My dog Chloe ran around the yard, and then she dug a hole in the flowerbed.
~Reinforcing Proper English by Reviewing Punctuation, Grammar, and Spelling Rules