I’m sure GE can respond better, but internally MS has a SP3 and has been labeling certain hotfixes as SP3 for at least a year.
To those who create their own slipstream winXP install disks, ryanvm.net has continuously updated SP3 slipstreams available. Every few months as more SP3 fixes are added by MS, ryanvm.net recompiles the slipstream and privides a torrent to d/l it.
I have a feeling I’m not saying anything most people here don’t already know though.