Atun - 5:37 am on Nov 1, 2010 (gmt 0)
People are trained to mostly use non-hyphenated names
I was going to mention that too though that was outside of your request for Adwords experiences.
We all want people to easily type in our site names too in and many folks cannot manage to find or remember that hyphen.
In fact on some older, more popular hyphenated domains that I own, I even bought the non-punctuated version and had it redirect to the hypenated sites.