The standalone aoe driver from the Coraid website determines where to install the aoe module by using the Makefile in the kernel sources. On Mandrake 10.0, 10.1, and 10.2 (2005LE), the module installation directory from the kernel sources doesn't match the running kernel.
You can easily specify the location where the aoe module should be installed by adding it to the "make" command line. Instead of just doing "make install", you can do ...
make install INSTDIR=/lib/modules/`uname -r`/kernel/drivers/block/aoe
Thanks to Joshua Kugler for providing Mandrake-specific information.