This is what I've got: http://www.bhphotovideo.com/bnh/cont...=242579&is=REG

It holds 8x10's and fits in a camera bag, briefcase, FedEx box, etc. There are a lot of others out there that are very fancy - a few hundred if you want - but this gets the job done. It has 12 double sided pages, 24 prints. I don't fill it, 12 images or so should say enough. Some people do individually mounted and matted prints, too. Since you're not really given any guidelines on what they want, they're probably interested to see how you do it. One subject, whether architecture, environmental portraits, road kill (yes, someone did a book a few years ago on this) or whatever is probably most common way to do it.

I'm also interested to see what others say - it seems like a hard question to get answers to for some reason.