You may or may not have heard of a new game appearing called 'Spore' which is being released in September. The makers, 'Maxis', have released a limited demo version where you can create creatures and then share them online. The demo can be got here:
Trial
If you want to see what it's about then view the small video footage found here:
I've had a play around myself and found it great fun. If you've got kids then it's a gore free way of having a little fun....

__________________