Dave Shea's Font Size: No Happy Medium (and its follow-up, Font Size Redux) suggests a limited liability for designers in matters of font accessibility and readability. Are users with special needs responsible for their own browsing experience now that accessible alternatives, like the Mozilla family of browsers, provide extended control over font sizing? We'll chime in when we abandon absolute font sizes.
Unrelated
Dan Vine's iCapture eases the uncertainty of not knowing how this (or any) site looks "through the eye of a Mac browser." Good to know.