Interesting. I tried http just now (while you were editing your post!) and it redirected to https. Maybe MagicalTux was redirecting while you were editing and I was testing? :-)
Nah, I added a header that says to your browser (if it's intelligent enough) that it shouldn't try to access the site without SSL.
Ha! My browser is more intelligent than Littleshops! :-)
Seriously, though, good idea. For sites like MtGox users really should only access them securely.