I made a repository on googlecode for a version which runs on Snow Leopard..
For me the advantage is I can easily provide the code and changes.. and maybe get some feedback how dumb my changes are.. hehe. Which they are probably - yet I can finally start it, open and save maps.
I have first committed revision 402 from NetRadiant, and started to modify on that - so all changes are easily visible.
I hope this ain't a to bad Idea, but I somehow wanted to share my changes.
And last radiant for OSX is at rev. 295.. or something.
Actually I started mapping on Linux, and it was very easy to compile NetRadiant, but under OSX its a pita.
I still have to test stability and all.. but its great to be able to use my favorite editor again..
http://code.google.com/p/osxnetradiant/
I had various problems using the existing versions, either they did not start. Or they did, but then crashed on open/saving. Some fixes I found helped to make it start.. but not more. I suppose I have there some serious error with the libraries.. But I have honestly no experience at all with OSX.