http://dictionary.reference.com/search?q=mouses
Quote:
pl. mice or mous·es (mousz) Computer Science. A hand-held, button-activated input device that when rolled along a flat surface directs an indicator to move correspondingly about a computer screen, allowing the operator to move the indicator freely, as to select operations or manipulate text or graphics.
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http://www.wordiq.com/definition/English_plural
http://www.allwords.com/word-mouses.html
http://www.saugus.net/Computer/Terms/
There are plenty more sources that say "mouses" is correct, but I guess anyone that uses dictionary.com must be a moron.
I think people who put extra letters like u's where they don't belong (as in colour and honour) are morons too.