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I've just spent ages trying to get an iMac running Gentoo Linux 2004.3 setup to run Xorg and GNOME - There seems to be a complete dearth of information on the net on the specifications for this particular machine, I couldn't find monitor vertical or horizontal refresh rates, sync settings etc or anything.
The machine is as follows:
 flowerpower root # uname -a
 Linux flowerpower 2.6.9-gentoo-r1-g4 #3 Fri Dec 10 19:07:02 GMT 2004 ppc 750CXe PowerMac4,1 GNU/Linux

 flowerpower root # cat /proc/cpuinfo 
 processor       : 0
 cpu             : 750CXe
 temperature     : 23-25 C (uncalibrated)
 clock           : 500MHz
 revision        : 34.20 (pvr 0008 2214)
 bogomips        : 995.32
 machine         : PowerMac4,1
 motherboard     : PowerMac4,1 MacRISC2 MacRISC Power Macintosh
 detected as     : 256 (iMac "Flower Power")
 pmac flags      : 00000001
 L2 cache        : 256K unified
 memory          : 576MB
 pmac-generation : NewWorld
 
 flowerpower root # lspci
 0000:00:0b.0 Host bridge: Apple Computer Inc. UniNorth/Pangea AGP
 0000:00:10.0 Display controller: ATI Technologies Inc Rage 128 Pro Ultra TR
 0001:10:0b.0 Host bridge: Apple Computer Inc. UniNorth/Pangea PCI
 0001:10:17.0 Class ff00: Apple Computer Inc. KeyLargo/Pangea Mac I/O
 0001:10:18.0 USB Controller: Apple Computer Inc. KeyLargo/Pangea USB
 0001:10:19.0 USB Controller: Apple Computer Inc. KeyLargo/Pangea USB
 0002:20:0b.0 Host bridge: Apple Computer Inc. UniNorth/Pangea Internal PCI
 0002:20:0e.0 Class ffff: Apple Computer Inc. UniNorth/Pangea FireWire (rev ff)
 0002:20:0f.0 Ethernet controller: Apple Computer Inc. UniNorth/Pangea GMAC (Sun GEM)

Hopefully that'll allow someone else to identify the machine, it seems to be basically the same hardware as an iMac DV and I think they were sold as "Flower Power", "Snow" and something else along those lines... Either way, here's the /etc/X11/xorg.conf I'm now using, hopefully it'll be of use to others...
 # File originally generated by xorgconfig and then tweaked to 
 # work by John Baxendale / http://www.siftah.co.uk
 # Kernel commandline is: video=aty128fb
 
 Section "Module"
     Load        "dbe"
 	    SubSection  "extmod"
     	  Option    "omit xfree86-dga"
     	EndSubSection
     Load        "type1"
     Load        "speedo"
     Load        "freetype"
 EndSection
 
 Section "Files"
     RgbPath	"/usr/X11R6/lib/X11/rgb"
     FontPath   "/usr/share/fonts/misc/"
     FontPath   "/usr/share/fonts/TTF/"
     FontPath   "/usr/share/fonts/Speedo/"
     FontPath   "/usr/share/fonts/Type1/"
     FontPath   "/usr/share/fonts/CID/"
     FontPath   "/usr/share/fonts/75dpi/"
     FontPath   "/usr/share/fonts/100dpi/"
     FontPath   "/usr/share/fonts/local/"
 EndSection
 
 Section "ServerFlags"
 # Nothing here.
 EndSection
 
 Section "InputDevice"
     Identifier	"Keyboard1"
     Driver	"Keyboard"
     Option "AutoRepeat" "500 30"
     Option "XkbRules"	"xorg"
     Option "XkbModel"	"pc105"
     Option "XkbLayout"	"gb"
 EndSection
 
 Section "InputDevice"
     Identifier	"Mouse1"
     Driver	"mouse"
     Option "Protocol"    "Auto"
     Option "Device"      "/dev/input/mice"
     Option "Emulate3Buttons"
 EndSection
 
 Section "Monitor"
     Identifier  "iMacDV"
 	HorizSync 60-60
 	VertRefresh 60-75
 	Modeline "1024x768" 78.740 1024 1056 1152 1312 768 769 772 800  HSync  VSync
 EndSection
 
 Section "Device"
     Identifier  "Rage128 TR Ultra AGP"
     Driver      "r128"
     VideoRam    16384
     Option "UseFBDev"
 EndSection
 
 Section "Screen"
     Identifier  "Screen 1"
     Device      "Rage128 TR Ultra AGP"
     Monitor     "iMacDV"
     DefaultDepth 24
 
     Subsection "Display"
         Depth       8
         Modes       "1024x768" "800x600" "640x480"
         ViewPort    0 0
     EndSubsection
     Subsection "Display"
         Depth       16
         Modes       "1024x768" "800x600" "640x480"
         ViewPort    0 0
     EndSubsection
     Subsection "Display"
         Depth       24
         Modes       "1024x768" "800x600" "640x480"
         ViewPort    0 0
     EndSubsection
 EndSection
 
 Section "ServerLayout"
     Identifier  "Simple Layout"
     Screen "Screen 1"
     InputDevice "Mouse1" "CorePointer"
     InputDevice "Keyboard1" "CoreKeyboard"
 EndSection
 
 Section "DRI"
     Mode 0666
 EndSection
I hope that helps others, it's not great but at least it gets you up and running.