If there is a MIB for it, most SNMP Capable Management servers can poll them.
This can be such as FHRP states, Routing Peers, ASA Failover status, Seriel numbers for inventory purposes.
The potential is almost endless, it just depends what you should monitor to ensure you are in the know when your network hiccups.
Here is a link to the IOS MIB Viewre
http://tools.cisco.com/ITDIT/MIBS/MainServlet
--
CCNP, CCIP, CCDP, CCNA: Security/Wireless
Blog: http://ccie-or-null.net/
--
CCNP, CCIP, CCDP, CCNA: Security/Wireless
Blog: http://ccie-or-null.net/