(svn r3740) -Feature: [OSX] added OS version, CPU type and newGRF settings to assert window and a message to tell people to add that to a bug report
It also adds a new error window, which can be used just like assert, but it is also active when asserts are turned off
This is useful for places where it's really important to check even if assert is turned off. It's not used in the code yet

(svn r3281) -Feature: [OSX] added native cocoa sound and video drivers (egladil)
you can still use SDL drivers if you like and you have to run "make upgradeconf" to start using the cocoa drivers (or manually write WITH_COCOA:=1)
since SDL breaks the cocoa drivers, you can't compile with both SDL and cocoa support
Using cocoa drivers makes it easier to make universal binaries and it solves:
-FS#18 [OSX] SDL is weird in universal binaries
-FS#2 [OSX] lazy pointer crash on exit
-FS#10 [OSX] linking error when linking statically to SDL 1.2.8 (needless to explain this, but it means it should be able to compile statically with the default settings now)
-[ 1215073 ] Switching to large size out of fullscreen crashes
Using SDL drivers will still have those issues though

(svn r2703) - Feature: [OSX] Added a native alert window to show whatever error() needs to print (Tobin made this, while I fixed some issued in it)
- As a bonus, we now have an objective C file (os/macosx/macos.m) to use the functions Apple made to interact with OS stuff