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With earlier versions you had to do a separate install from the CD but I don't think that is the case with 436 or GOTY; it wasn't for me anyway. You then need to tell UT to use Open GL instead. Personally I did this by editing the ini file.
i.e. GameRenderDevice=OpenGLDrv.OpenGLRenderDevice

However, you'll also need to add a couple of lines to the [OpenGLDrv.OpenGLRenderDevice] section of the file when used on the GeForce 2 or you'll most likely get an error along the lines of 'minlog maxlog texture size'. I assume the same is true for the GF3. Anyway, this is how mine reads:
[OpenGLDrv.OpenGLRenderDevice]
Translucency=True
VolumetricLighting=True
ShinySurfaces=True
Coronas=True
HighDetailActors=True
DetailTextures=True
MinLogTextureSize=0
MaxLogTextureSize=10
MaxLogUOverV=10
MaxLogVOverU=10
UseMultiTexture=1
TextureComposite=True
Texture32Bit=0
Use32bit=1
DoPrecache=0
DescFlags=0
Description=

Three things I'd like to point out...
::1 zZzZ, seeing as you're not even a registered user of this forum don't speak as if you represent the whole board. Yes, some question do come up again and again but that's no reason to be rude.

::2 It is true that UT was never 'optimized' for OpenGL but it does work

::3 iam skyline, from what I've seen on my GF 2MX Open GL is certainly faster than Rave. I just recently went over to Open GL on my setup because I swapped out a Voodoo 5500 card.

--
In any case, zZzZ is right in that you will want to do a full install and then patch straight to 436. You don't have to do a separate install, the 436 patcher will update your existing installation. However, you will have to have the UT CD in your drive as the patcher copies some files; if memory serves me.

As for the ini editing, no, there shouldn't be anything after description. I've seen some other reports of thew type 2 error but I never got it so I'm not sure what triggers that. One suggestion may be to up the memory allocated to UT. The initial Open GL installer readme did mention that you would have to allocated significantly more memory to UT in order to get Open GL going. FYI, I've given UT an allocation of 210MB. For other tweaks check out the help pages and especially the commented ini file available from the main page. I could also mail you my ini file.

Surely there must be an "Extensions" folder inside your "System Folder" folder. If you have a new Mac that came with OS X installed make sure you're not looking in the "System" folder.

Once there, you don't have to delete the "OpenGLRendererATI" extension. Just move it to somewhere outside the "Extensions" folder and restart. That way you can put it back easily in case you need to.

LOL

That's great!

As to why Rave would be faster than OpenGL I don't know... From what I've read and my experience nVidia's OpenGL drivers should be better than Rave. One thing I did find was that OpenGL actually seemed to perform better on higher resolutions; ie go to 1024x768 or above. Other than that, did you have a look at Eko's commented ini file?

I do find that OpenGL looks nicer than Rave though even if that's a very subjective test.