List pages by custom field

Hi all!

I will cut to thre chase:

I define custom fields in each Page that I publish and I would like the wp_list_pages() to sort the list in the side bar by a given custom field. Is that possible?

For example: I have a key called Project. I can have 3 values for that (A, B and C). Can I tell to list the pages in the wp_list_pages() tag according to these values? If not is there any other way instead of using wp_list_pages tag?

It would be great if someone can help me out I am really getting desperate on this one!