the Codex Transportica has had a great article written about it over at the Inspiration Bit website. i think Vivien has done a great job (it couldn't have been fun going through the underlying Transportica code) and there are a good list of suggestions for improving the design of the site.
if you are interested in web typography (or just typography in general) then you will enjoy the IB articles. i know there are several tips i've taken onboard from reading past posts.
(i'll be doing a tutorial for inspirationbit.com about how i did the Transportica banner image, but it might take me a while to finish it.)
i'll end just by saying how grateful i am to Vivien for writing the piece.