Problems with CANON 40d

Hi.
I have reed the topics related with CANON cameras but none resolved my problem.
I'm quite new to mac world but I recently purchased a MacBook Pro 2.66 that came pre-instaled with snow leopard. What was my surprise when a plugged my CANON 40D to it with USB cable! The computer doesn't recognize the camera! The camera keeps flashing the "Busy" message and nothing else works. Strange, I'm quite new to MACs but my wife have a MacBook Air with Leopard and everything works OK. What's wrong then? Anyone has or had the same problem?
I see i'll have to purchase a CF card reader, since I don't have any I have to "BOOTCAM" in order to take my photos off the camera...

What a shame!

Thanks for an answer!

Luis