You can easily enter any country in the Schengen area (25 countries). See, for example, this unofficial Schengen visa website. I've done that personally before.
From personal experience, German immigration does not really agree with this idea. In Frankfurt they refused the entry of a friend because she had received her visa from the Italian embassy. Nevertheless, they let her in after a few tears. Moral of the story: Yes, you can enter Schengen with your Schengen visa, regardless of the issuing country.