How often should I charge it?

I have heard that if you charge it often like every day and you only use a little battery for that charge it will create a 'memory' and will affect battery life. So my question is should i charge it nightly or only when the battery is low

here is some very good battery information
http://docs.info.apple.com/article.html?artnum=60970
http://docs.info.apple.com/article.html?artnum=61475
http://docs.info.apple.com/article.html?artnum=62018
http://docs.info.apple.com/article.html?artnum=304681
http://docs.info.apple.com/article.html?artnum=61127
http://docs.info.apple.com/article.html?artnum=61434
KoDor

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