Bob Atkins , Jan 06, 2007; 02:00 p.m.
Yes. Such adapters have been available for over 10 years, though they're now a lot cheaper than they used to be!
You're looking at a price of around $20 for a low end item to maybe $80 for a premium version. The more you pay the better the machining and quality of the finish, but the $20 versions work fine. You can even get them with electronics which allow the focus confirmation of the EOS body to operate (not AF, but the manual focus "green dot").