I created a new content type and added Vimeo to the list.
I also added the Vimeo module that is linked to this module.

When I add a Vimeo link I get a 500 error page and the log tells me this:

[Mon Dec 12 12:23:24 2011] [warn] [client ******] mod_fcgid: stderr: PHP Fatal error: Cannot redeclare emvideo_vimeo_info() (previously declared in /sites/default/modules/media_vimeo/includes/providers/emvideo/vimeo.inc:22) in /sites/default/modules/emfield/contrib/emvideo/providers/vimeo.inc on line 37, referer: /admin/content/node-type/vimeo/fields/field_embedded_video_url