Partha now on xp works, and at the first attempt!
i didn't try with python yet but as far the other plugin everything works.
humm loking better i am sure python will not work out of the box, because the py console doesn't show up, but i saw there is some how to about python in the previous page ,going to read it now
For sure on xp i have a old python version (because the only supported by gimp 2.6 )maybe just install one more updated will help
About make more user friendly the installer is not a big issue, unzip and set a desktop link for gimp.exe is not rocket science even for many windows user
the main obstacle is the need to edit the enviromental variable, if could be arranged to be portable
i believe that will solve
well i have a lot of other idea i may share here or by pm but the basic point to solve first seems that
of the enviromental variable, no idea how the other sw solve (i had a lot of entries in xp for Path, since i only added 1, the others were automatically added when installing new programs)