Namely, fglrx will start complaining that it needs Xorg 7.1.0.0 (protocol?? version) and can only find 1.3.0.0 (release version??) and will bork to a text console.
If you get this, to at least get in to a GUI, substitute 'vesa' for 'fglrx' in your xorg.conf, then set about a rollback of your xorg update (or do what I am doing and be too busy this week to bother with a rollback and sit on a vesa driver [no SL of course] waiting for AMD/ATI to wake up) ;-P
Latest driver (8.36.5) doesn't fix it.
Any better ideas for avoiding a rollback are wlecome

(I normally don't run Debian/unstable but needed a bugfix urgently, which pulled in other stuff, which pulled in other stuff)
