for whoever was looking for a x200 impression
i haven't tried the official ebuild for this release since it hasn't yet got into portage, but i've tried an overlay one, and i must tell that i've got the libc problem too after installing it.
i must investigate if this is due to the latest xorg server, or to the fact i'm using the latest mesa or to the fact of using xcb (it seem that xcb will be the default for multimedia framework in kde4). the libc error makes me think that the problem stands into the xcb and i'd like some confirmation that the 8.1 supports xcb binding or if it will support it in the future. 7.12 seemed to support it with the old xorg-server and mesa 7.
as for the exa stuff: if you want to enable it add:
in your xorg.conf. if you see the exa module loading then the driver supports it, otherwise not. for what i know it doesn't yet supports exa.Option "AccelMethod" "EXA"
currently i'm testing the latest xf86 with the r300 exa support that seems to play nice. i'll post some experience of it in the opensource forum soon. the first impression is: no opengl support with exa, which is not a very good stuff, but xv seems to work quite well.