Dave,
 
I'm thinking about buying the Ultrasonic Range Finder SRF08.  I read that you are using one as well.  How is it performing for you?  Is there anything else you would recommend?  I basically need a way to detect objects in front of my robot so he doesn't keep running into walls.  Any thoughts on the SRF10?  I didn't see much of a difference in the specs or price between the SRF08 and SRF10.
 
Kinds Regards,
 
Hayden Owens.