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One option is some sort of note keeping program. I like Evernote — it has desktop, online and iphone versions, so I have notes wherever I go. I keep a clients folder with notes per client, and it does a good job of keeping everything organized.

One thing I ran across the other day which seemed like a cool idea (but perhaps you wouldn’t end up using all of the features) is http://www.freelancesuite.com/. It has a useful client management section which might come in handy.