Same network printing issue here.
I am trying to print from a Windows Vista Laptop to a Canon IP2600 on a Linux Mint 9 desktop via IPP.
The print job launches on the Vista laptop then after a minute the status changes to "Error - Printing". This is really annoying because I had network printing working fine on a prior version of Ubuntu.
Unless an answer can be found I will reluctantly give Samba a go next. Although in truth I really shouldn’t have to because IPP should just work out of the box.