Q: I'm having trouble uploading iphoto book to apple

Have you previewed the book? Can you create a PDF preview as described here Preview a print project in Photos, iPhoto, or Aperture to avoid issues - Apple Support ?  And does the preview finish?

If yes, the upload may be blocked by a firewall or antivirus software. If you are using tools like Kaspersky or Little Snitch,disable them temporarily, so iPhoto can reach the server.

Which version of iPhoto are you using?  You can no longer order books from iPhoto '08 or earlier.  Only iPhoto '09 and iPhoto '11 are supported, see:  Apple Photo Services: Product line details for books, cards, and calendars - Apple Support

If you are using 'iPhoto '11, have you set the Print Products Store to the correct country - in Photos > Preferences > Advanced?

This is happening to me, too. I think I have tried about three dozen times, and it stalls at the same point. Anyone know what to do?

I have iPhoto 11, and none of your suggestions have worked. Any others?

Are you in Denmark or another nordic country?

Apple's servers have been down for several weeks in Denmark, Sweden, Finland.

See.  Re: Photo store closed for update? Been going on for days??

Contact the print products store and ask, when the service will be available in your country.

http://www.apple.com/shop/help/print_products

In a few cases it helped to reset iCloud Keychain, see this discussion:  https://discussions.apple.com/message/28642826?ac_cid=tw123456#28642826