Joe Shaw writes about adding something like KDE's Autostart to Gnome and there I read too, why it was such a pain of stopping netapplet, and resapplet (and I suppose suseplugger and susewatcher too) from starting on my SuSE 9.3: they hardcoded it! What a shame! (I'd use more than one “!” if I'd be insane enough. (Who did say only insane people use more than one “!”? Some character in a book of Douglas Adams, or Terry Pratchett?))
What I did? I did move them out of the way… Maybe there's an easier way of stopping them (like using the .runbeagle to start beagle, which has a problem sometimes too, because it gets started twice). So at least there is some hope.