CafePress seems to be a mite closer to launching their book printing arm. I just got an intriguing email offering me the chance to beta it; alas, I don’t have a book all ready to go. C’est la vie. However, the email does have some hints about formats.
They want page sizes of either 4.18 × 6.88 (mass market paperback), 5 × 8, 7.5 × 9.25, 8.5 × 11, or 6.625 × 10.25 (comic books). That’s inches, one assumes. They offer saddlestitch binding for lower page counts and wire-o for full fledged books. Maximum page count is 600 pages.
That’s kind of interesting, since people were expecting perfect bound books. Then again, maybe the perfect bound books work, um, perfectly and they don’t need to beta test those. More to come, I’m sure.