Most excellent -- I stumbled across a fedora bugzilla that appeared to be tracking my own issues. For anyone else having problems, just grabbing the latest xorg-x11 rpms will correct the problem -- xorg-x11-6.8.1-24 and subsequent dependencies (xorg-x11-devel, xorg-x11-libs, xorg-x11-xfs). It's too bad that the buggy driver made it into the FC3 release...
Also, to avoid serious head-on-table sessions, the old posted link to http://people.redhat.com/krh/i810_drv.o
is no longer in service. This driver appears to have made it into the new xorg-x11 packages.
Thanks for the help, all! =]