I followed the
Ethernet Bonding HOWTO I found, but I ended up with errors when I tried to restart the network. As it turns out, functionality required for the bonding module
isn't present in the drivers for my 3com cards.
The HOWTO is old (2000), so I'm looking around for any information that might lead me to a way to get this to work with the newer 2.6 kernel and modules . . .
*Edit: Fixed the HOWTO link