As of March 2008, ISATAP has been re-published as an informational-category RFC [RFC5214] which obsoletes the previous experimental-category version [RFC4214]. A development history of RFC4214 is on the ISATAP Issue Tracker Page

As of April 2008, ISATAP is implemented in the publicly available Linux operating system kernel, beginning with linux-2.6.25. ISATAP is also implemented in other widely-deployed systems including Microsoft Windows XP, Microsoft Windows Vista, cisco IOS, 6WIND 6WINDGate, and FreeBSD/KAME.

A new architecture called Routing and Addressing in Next-Generation EnteRprises (RANGER) is progressing through the RFC publication process as a successor to ISATAP, and in some sense can be considered as ISATAP version 2. RANGER is an architectural framework that extends the basic functions of ISATAP to also include IPv6 autoconfiguration, IPv6 prefix delegation, router-to-router tunneling, adaptation to diverse tunnel MTUs and IPv6 multicast. RANGER combines the functional elements specified in Virtual Enterprise Traversal (VET) and the Subnetwork Adaptation and Encapsulation Layer (SEAL).

Other I SATAP-related links:
Towards the full Deployment of IPv6 - the Experience at Swisscom Innovations
Ericsson Roams on IPv6
Linux ISATAP Setup
ISATAP automatic configuration with DHCP4
JOIN Homepage - Howto install and configure ISATAP?
isatap.kddilabs.jp Page (in Japanese)
Internet Protocol Version 6 (Microsoft)
Cisco IOS Software Release 12.3T New Features and Platforms
Implementing Tunneling for IPv6 (cisco)
Federal Agencies and the Transition to IPv6
How to use ISATAP on KAME
The Implementation of ISATAP Router (on Linux)
Miredo project unleashes ISATAP server
ISATAP - Wikipedia, the free encyclopedia