First of all, thank you for creating this conversion tool. I've used it to import two Posterous blogs.
As I anticipated, the photo galleries couldn't be converted to a WP counterpart; but I can work on that on my own.
What did bother me though is that ALL of my photos and other .jpg's were reduced in size by 50%. I don't see anyone else reporting that here. Do you have any idea what might have happened and/or a solution to fix this? It would be too much work to go into every post and re-import each and every photo.
I've noticed that if I click on any of my reduced photos, the full-size version appears in a new window... but I just want them full-size in each post, not clickable at all.