Custom Post Types & Additional Content?

Hi guys, just starting to play with WP3 and think that its superb!

Anyway, if I was to create a custom post type for say a book, and I want to have textboxes for ISBN, Author, Release Date, etc alongside the normal content editor, how would I do this?

Also, on a lot of my pages, there are two very separate areas of content and at the moment the client has to use html to put divs in the content box which is less than ideal, how do I define additional content areas for standard pages?

So yeah, two questions of a similar nature… any ideas? I’m sure it must be possible…