2) The number of texture units gets reported as 8, because hw driver sets MaxTextureUnits, but Mesa looks at the minimum of MaxTextureImageUnits and MaxTextureCoordUnits. This causes troubles with all apps which actually try to use these units (such as ut2003, it will still run, but will get lots of Mesa user errors and performance will be horrible). Don't know if the obvious fix (setting these values in the hw drivers) is the right thing to do (and btw it would be really really nice if it would be possible to set them to 4 or 6 instead of 2...).
3) Things like QuakeIII and nwn seem to run just as before. Lighting in NWN (TCL path) has changed a bit, still wrong, but looks more like it did half a year ago (I believe that's because the patches which fixed Flightgear problems as Felix mentioned didn't make it in).
Roland
P.S: slightly offtopic, but the old 5.0.2 Mesa in the dri tree had a bug in _mesa_CompressedTexImage2DARB (teximage.c).
texObj->Image[level] = texImage;
needs to be
_mesa_set_tex_image(texObj, target, level, texImage);
If not it definitely will cause OGL apps which try to use compressed textures with cube maps to crash (I just stumbled upon this when I enabled some half-working s3tc support for the r200 driver). Though I believe it's fixed in Mesa 5.1, and the bug might not even be in the standalone tree, so nowhere to send the bug report ;-)
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