I have a friend from Denmark who is coming to visit my parents in Canada this summer and was wondering if Denmark is on the visa waiver program? I would love to have him come visit me here in the states.
Just wondering if that's doable?

google would be your friend..

Andorra
Iceland
Norway
Australia
Ireland
Portugal
Austria
Italy
San Marino
Belgium
Japan
Singapore
Brunei
Liechtenstein
Slovenia
Denmark
Luxembourg
Spain
Finland
Monaco
Sweden
France
the Netherlands
Switzerland
Germany
New Zealand
United Kingdom

http://travel.state.gov/visa/temp/without/without_1990.html