Sometiems for no reason at all my phone will take a screen shot when i press the home button without anything else being pressed. Any ideas?

This might sound a bit odd but are you holding the phone correctly? It can only take a screen shot when you are holding down the power button and the home button at the same time maybe you are accidentally touching both buttons when you push the power button.

Hope that helps.

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Nope i am not touching the power button. I quick look on the forums and you will see it is a known issue.

From time to time my Sensation starts taking screenshots for no apparent reason.
Yes,you can take take a screenshot by holding down the Power button and Home simultaneously

Odd..I never had that problem when I had my Sensation. Is it stock or are you rooted?