Partial Answer . . . . . . . . . . . . . . . . . . . . .
I still haven't found any links, but after installing PDM v2.1(1) on my failover PIX, I found this in the PDM help page "What's New in PDM v2.1":
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What's New in Cisco PIX Device Manager version 2.0 and 2.1
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Support for PIX 6.2 features
-Auto Update
-Command Authorization
-DHCP Option 150 & 66
-Factory Default Configuration
-Failover on MAC Address
-H.323 RAS Fixup
-ILS Fixup
-LAN-based Failover
-N2H2
-NTP
-Object Grouping
-Outside NAT
-PPPoE
-Stub Multicast Routing
-TurboACL
-URL enhancements, Long URL
-Easy VPN Remote Client
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New Operating System & Browser Support
-Windows XP
-Red Hat Linux 7.1 and 7.2
-Internet Explorer 6
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Easy VPN & VPN Wizard
-VPN configuration
-VPN monitoring
-VPN Wizard assists in configuring a site to site VPN or a remote access VPN
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Startup Wizard
-Makes bringing up your firewall simple and fast.
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Other Enhancements
-Configuration of host name and domain name
-Display user licenses
-New graphs and enhancements
