Making the Google embedded code XHTML Strict was pretty easy and involved replacing <iframe> with <object> and massaging some of the parameters.
This works in Firefox and Opera. Naturally it does not work in Internet Explorer 7. There is a hack that might get it to work which I will keep fooling around with.
The iframe code validates and works fine in XHTML Transitional; I’m just playing with strict for grins.
Update: Using the <object> instead of <iframe> not only does not work in Internet Explorer 6 or 7, but locks that browser up. I’ve put back the original iframe code.