There is a workaround for the web administration interface SSL denial of service vulnerability. There is no workaround for the fragmented packet IPS evasion vulnerability.
Cisco has made free software available to address these vulnerabilities for affected customers.
This advisory is posted at: http://www.cisco.com/warp/public/707/cisco-sa-20060920-ips.shtml
CIAC would like to thank Cisco for this information.