Add Images from the media library to a gallery

I upgraded to wp 3.1 and installed the new gallery theme. That killed all of my previous custom gallery post types. I thought that it would. When adding a gallery in a an exhibit is there a way to add images from the media library? re-uploading them would suck even worse than not having the previous gallery post types.

It appears that the gallery theme only uses the wordpress gallery that organizes them by custom post types. Is that how it works?