Exporting from IPhoto to Bridge - How do I do it?

Hi mister cheese,
Are you not going to use iPhoto anymore?
If you are NOT going to use iPhoto all you need to do is drag the Originals and Modified (the edited versions of the Originals) folders from the IPhoto Library folder to your Pictures folder. You can then delete the iPhoto Library folder.
You should be left with the Originals folder and Modified folder in your Pictures folder.
Browse these folders with Adobe Bridge.
Also make sure you do not have iPhoto open when you connect your camera.
iPhoto: How to Change the "Open Automatically" Preference

If you're going to use Bridge exclusively just drag the Originals folder to where you want it stored and point Bridge to it. No exporting to be done.

If you plan to still use iPhoto then make a copy of the Originals folder and, again, place where you want it for access by Bridge.

Since Bridge is a browser which uses Photoshop as the editing component I would think the first option would be what you'd want (just guessing). If you use Bridge to view and then edit photos in the iPhoto library folder the edited version will not be recognized by iPhoto and can mess up the library. You can, however, use Photoshop from within iPhoto its Preferences so that PS edits will be recognized.