This one surprised me because I didn't know you could do this so easily until I read it in the support email list. If you want to supress the display of author, publication date and taxonomy terms, do as David Metzler suggests:

• Go to the Administer -> Themes menu
• Select the "Configure" tab
• Uncheck "Display Post Information" for the appropriate content type

I used to just modify the theme. But this is simpler if all you want to do is stop displaying the metadata. Nice one.