Network Adapter Failover in Linux?

Brian the Wise asks: "Is there anything avaible for Linux that can compare to the IP Multipathing in Solaris 8? I need it specifically for the active/passive failover of ethernet interfaces. A search around the net has only come up with HA Linux and LVS, but they're both talking about complete machine failover. All I want is for the system to move the IP configuration from one ethernet interface to a dormant one on the same machine when it detects the link going down on a single machine. Is there anything with a proven track record out there?"