wordpress 2.5 gallery from other posts

I love the new gallery feature in WP 2.5, but I was wondering if anyone knows a way that I could build galleries using images from other posts (i.e. the ones in the image library)?

Basically, I’d like to do a weekly recap gallery of my favorite posts, and each thumbnail could be pulled into a gallery which would link back to the original posts. I know I can do this manually with the image browser, but that doesn’t automatically arrange the images or add captions.