From The fifth Edition of the Concise Oxford Dictionary (with some added examples):
THEN is primarily an adverb used to indicate:
'At that time', eg: As it was thought back THEN " ... "She THEN became too much trouble" ... "I believed, THEN, that they were right."
'Next, afterwards or after that', eg: "Wash it first, THEN let it soak for half an hour" ... "Her face went pink, THEN red, and THEN she burst into tears." ... "Babies usually crawl THEN walk."
THAN is commonly used to introduce a second person or item into a comparison, eg: "His bark is worse THAN his bite: ... "Better late THAN never" "You are stronger THAN me, although I am bigger THAN you"
For more help with these and other common mistakes in written English, go to this link and improve your poetry skills no end!
http://esl.about.com/lr/common_english_mistakes/351117/3/
Many poets seem to confuse these two words, so here is a simple guide to help sort them out.
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Comments
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Beautifully said, and well conveyed

I wish I was a That
But I am just a When
I just wear an Aussie hat
And wonder when I'm When.

Lis. -
ah hah this will be very handy for some people... well done
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Hope so!
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