Using * as a selector is a pretty bad idea. For example, it takes forever to load the page and run the script, since Cufon blocks the browser while it draws. Secondly, your text will not be displayed depending on the browser. (At this time, FF3.6 does not display Cufon text selection)
But to answer your question, you can point cufon to specific classes, just add classes to the elements you want to draw Cufon, and not vice versa.
Cufon.replace('h2.cufon', { fontFamily: 'MyFont' });
Edit:
Just found that if you use a Javascript library like jQuery, you can use a different selector to exclude elements.
Cufon.replace('h2:not(.nocufon)', { fontFamily: 'MyFont' });
This will replace all H2 elements with Cufon text, except those that have the nocufon class.
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