For example, http://developer.apple.com/cocoa/pyobjc.html is still for OS X 10.4 Tiger, not 10.5 Leopard.. And that's the official Apple documentation for it..
The official PyObjC page is equally bad, http://pyobjc.sourceforge.net/
It's so bad it's baffling.. I'm considering learning Ruby primarily because the RubyCocoa stuff is so much better documented, and there's lots of decent tutorials (http://www.rubycocoa.com/ for example), and because of the Shoes GUI toolkit..
Even this badly-auto-translated Japanese tutorial is more useful than the rest of the documentation I could find..
All I want to do is create fairly simple Python applications with Cocoa GUI's..
Can anyone shed light on the horrible documentation, or point me at some tutorials that don't just give you huge blocks of code and assume you know what NSThread.detachNewThreadSelector_toTarget_withObject_("queryController", self, None) does..?
I agree that that tutorial is flawed, throwing random, unexplained code right in front of your eyes. It introduces concepts such as the autorelease pool and user defaults without explaining why you would want them ("Autorelease pool for memory management" is hardly an explanation).
That said…
basically all I want to do is write Cocoa applications without having to learn ObjC.
I'm afraid that for the time being, you will need a basic grasp of ObjC in order to benefit from any language that uses Cocoa. PyObjC, RubyCocoa, Nu and others are niches at best, and all of them were developed by people intimately familiar with the ins and outs of ObjC and Cocoa.
For now, you will benefit the most if you realistically see those bridges as useful where scripting languages truly shine, rather than trying to build a whole application with them. While this has been done (with LimeChat, I'm using a RubyCocoa-written app right now), it is rare and likely will be for a while.