I would like to add some information to the web version that is different from the e-mail version of the campaign. For example I want to have a flash video on the web version that is now on the email version. Does anyone know if there is a way to accomplish this?
The web version can't be modified I'm afraid - it really is just the email newsletter, but accessible via the web for referencing or convenience of rendering.
It sounds like you really want a separate version, and you'd be best off putting that on your website and linking to it from your email.