Not sure what's the deal here. I've tried.
Importing campaign from a zip and from the web. ( on the web everything displays fine - http://www.mmb580.com/holiday08/MMB_Holiday_Card.html )
In preview and test sends all images are broken and no links work.
Ran campaign through design/spam testing. Passed spam and images show up in the design tests.
Can't send this out until I am positive emails will be delivered correctly.
Sent in email support... haven't heard back.
We've definitely responded to all support requests, perhaps since you posted this. In my testing, everything imports fine, I'd suggest you setup a new campaign and try importing into that, and see if you get the same issue.