I have uploaded the packages to extras-devel.
But be careful, if you wanna use the whole cups-system.
There could be missing dependencies with the package cups.
I have only tested cups-client. That is enough to print with
a network printer. I also uploaded gtklp-1.2.3. This version has
no file open dialog, so you have to open it in the console with
gtklp <filename>. Version 1.2.7 has such a dialog and would be
better to use on the phone, but I was not able to compile it in
scratchbox. I think, that is because libtool2 is missing in scratchbox.
Maybe someone could try to package it.