I tried to install the hampton re0312.0 release today on a testbox and was 
able to make anaconda die horribly.

It was an nfs install on top of a raid1 filesystem with swap on raid1 as well.

Here is the stack trace. I have the entire dump file if it is needed.

Traceback (innermost last):
  File "/usr/bin/anaconda", line 627, in ?
    intf.run(id, dispatch, configFileData)
  File "/usr/lib/anaconda/gui.py", line 351, in run
    self.icw.run (self.runres, configFileData)
  File "/usr/lib/anaconda/gui.py", line 794, in run
    mainloop ()
  File "/usr/lib/python1.5/site-packages/gtk.py", line 2608, in mainloop
    _gtk.gtk_main()
  File "/usr/lib/anaconda/gui.py", line 513, in handleRenderCallback
    self.currentWindow.renderCallback()
  File "/usr/lib/anaconda/iw/progress_gui.py", line 135, in renderCallback
    self.intf.icw.nextClicked()
  File "/usr/lib/anaconda/gui.py", line 404, in nextClicked
    self.dispatch.gotoNext()
  File "/usr/lib/anaconda/dispatch.py", line 143, in gotoNext
    self.moveStep()
  File "/usr/lib/anaconda/dispatch.py", line 208, in moveStep
    rc = apply(func, self.bindArgs(args))
  File "/usr/lib/anaconda/packages.py", line 355, in turnOnFilesystems
    thefsset.makeFilesystems (instPath)
  File "/usr/lib/anaconda/fsset.py", line 1010, in makeFilesystems
    self.formatEntry(entry, chroot)
  File "/usr/lib/anaconda/fsset.py", line 963, in formatEntry
    entry.fsystem.formatDevice(entry, self.progressWindow, chroot)
  File "/usr/lib/anaconda/fsset.py", line 545, in formatDevice
    extFileSystem.formatDevice(self, entry, progress, chroot)
  File "/usr/lib/anaconda/fsset.py", line 467, in formatDevice
    entry.mountpoint)
  File "/usr/lib/anaconda/fsset.py", line 1707, in ext2FormatFilesystem
    os.execv(argList[0], argList)
OSError: [Errno 8] Exec format error

Local variables in innermost frame:
argList: ['/usr/sbin/mke2fs', '/tmp/md2', '-j']
childpid: 0
mntpoint: /
windowCreator: <method InstallInterface.progressWindow of InstallInterface
instance at 82a3528>
messageFile: /dev/tty5
w: <gui.ProgressWindow instance at 82ae9e8>
fd: 122
p: (123, 124)