Version 4.1 - 6.6.d Cisco EasyVPN
To start with, here is the Cisco page for Cisco EasyVPN Q&A.
And here are the Configuration Examples and TechNotes.
The main guide is Easy VPN Configuration Guide IOS 15M&T.
"The Cisco Easy VPN Remote feature eliminates the complication [of establishing a VPN connection between two routers] by implementing Cisco Unity Client Protocol, which allows most VPN parameters to be defined at a Cisco IOS Easy VPN server. This server can be a dedicated VPN device, such as a Cisco VPN 3000 concentrator or a Cisco PIX Firewall or a Cisco IOS router that supports the Cisco Unity Client Protocol."
An item of note: Cisco Site-to-Site VPN Technologies Comparison.
INE videos are really the best source of information for this. It covers:
IOS Easy VPN Server Configuration
- Dynamic crypto maps
- DVTIs
- ISAKMP profiles
ASA Easy VPN Server Configuration
IOS Easy VPN Client Configuration
- Client Mode
- Network Extension Mode
Note that these are the Remote Access VPNs creating on-demand dynamic IPsec Tunnels.