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Are you asking if you should have a footer link to your firm since they're a client, or are you asking something else?

I agree 100% with what Theo is saying. The use of CSS to replace images has gotten to a point (from a purely aesthetic standpoint) that you cant tell the difference anymore. It is effective and considered best practice to use text when possible. It compounds your pages SEO weight and can edge out your competition if they are using images as opposed to CSS to render text in its place. Style Sheets RULE!

I am experiencing the same thing! I just added my URL to Yahoo! directory (not search results), and I am getting the same error. Maybe, there is some kind of maintenance issue they're having? I tried it with 3 different browsers for my site.

Run it through HTTP Live Headers in Firefox (it's an addon). Just search for HTTP Live Headers. That will give you some insights as to how the browser is reading your page. It's very useful for when you need to diagnose issues like this.