The standard template for a new class in VS 2003 has been slightly irritating to me :) I finally googled this issue and found two nice articles by Michael Groeger on the subject. The first one is about changing the "Add Class..." template. The second one describes how to create a new template for Nunit test classes.
To the default class template I added copyright information and $Date$, $Author$, and $Rev$ keywords for Subversion. As well as removing the irritating: " TODO: Add constructor logic here" :)