As you may or may not have noticed, the content-rich EDN website has recently changed to a thin jump site with four links.  So to get right to the point your first question may be: "Where do I find the resources I need right now?"

Starting with ArcGIS version 9.3 in July 2008, developers are encouraged to use the new ESRI Resource Centers to access SDK documentation, samples, product technical information, as well as tools and resources for interacting with communities of ArcGIS developers around the world.

For the time being, the old EDN website will continue to exist and be the repository for developer content for ArcGIS versions 9.2 and prior.  It will no longer be used for ArcGIS version 9.3 nor beyond.

Why?

Our goal here is to create one single website for all users' product usage resource needs.  At version 9.2 and prior, developers used the EDN website and end-users of ESRI's GIS software tended to use the ESRI Support Center online. 

Feedback from the user community, as well as our own technology development goals indicate that developers need information about product installation, architecture, administration, and functional usage as much as any other user, and end-users more and more often are making use of information for product customization, components, scripting, programming, and other resources typically associated with application developers.  As our technology continues to grow along with the maturity of information technology, the lines between "user" and "developer" continue to blur and overlap.  It makes less and less sense to maintain two sites and have users decide which one to use.

So as you use the ESRI Resource Center online, we encourage you to interact with other developers like yourself, as well as GIS end-users and the resources they all use to be successful.  That is the place online where the EDN community will continue to grow, through code sharing galleries, discussion forums, video, and blogs from ESRI development teams, as well as new community tools and resources upcoming such as open chat, tech workshop webcasts, and a fully wiki'd Knowledge Base technical documentation set.

What about the EDN program?

The ESRI Developer Network software subscription program and its add-on training and support products are not changing. 

Developers around the world have found EDN to be a very cost-effective and simple way to access the entire ArcGIS technology and product base for product customization, implementation, as well as the design and development of applications and systems.   This has been a popular product and is not going anywhere.   Actually, ESRI is committed to making improvements and additions to the subscription program as our leadership position in the geospatial technology industry continues to grow.