How to force a rescan of the Uploads folder?

I'm updating a site from WP 2.0.1 (really). Something in the old DB really did not agree with the theme I want to use, so on the theme dev's suggestion, I exported/imported all content. All of the images failed to import.

The old upload folder isn't in the standard WP location*, so I moved all the files into /wp-content/uploads/. They're all organized by date, so that's consistent.

Of course, WP doesn't show them in the uploader. (Is that because there're no references for them in the database?) Is there a way to force it to rescan/add them?

Thanks!

*it's in [siteurl]/[siteurl]/wp-content/uploads. Really.