Perfectly normal warnings. Just ignore them. I don't even think there's anything you can do about them.
The PCI:x:x:1 device is just a place holder for the Windows driver, if I remember corretly. It's not used by fglrx. The device used in linux is the PCI:x:x:0 one. The X-server warns about it because it thinks there's another video card without a driver assigned to it. If you really, really want to remove that warning, you could try creating a dummy section for that PCI ID and assign a driver for it, but not use it. I have no idea if that'll work, though.(WW) fglrx: No matching Device section for instance (BusID PCI:0@0:19:1) found
Well, that's pretty straight forward. Perhaps there's been a change in the way Xorg reports its version number, and fglrx simply doesn't know how to parse it? Not much you can do about it though, and it's of no concern.(WW) fglrx(0): could not detect X server version (query_status=-1)
This one's, on the other hand, I have no idea. If you run glxinfo you'll see a list of GLX Visuals. Most likely you'll find the ones claimed not to be supported in there. I don't know what the relationship between GLX Visuals and AIGLX visuals is, if any. But that warning is normal, you can safely disregard it.(WW) AIGLX: 3D driver claims to not support visual 0x23