This thread contains Extranet Collaboration Manager release notes

Feature: Added Site Permissions Delegation Provider

When the Site Permissions Delegation Provider is selected on the Delegation Settings page a Delegated Administrator can manage Windows and Forms-Based-Authentication accounts that are members of the same SharePoint Groups the Delegated Administrators is a member of. This Delegation Provider is typically chosen when you would like to make a Windows account a Delegated Administrator of a site.

Feature: Add User page returns to the Manage Users page with the current group selected

When the Finish button on the Add User page is pressed the user will be directed to the Manage Users page. If the new user was added to a SharePoint Group, the group will be select.

Feature: Registration Approval Process

Define a list of approvers to review invited and/or anonymous registrations. When a user registers the account will remain unapproved until reviewed by an approver. One or more approvers will be notified of the pending registration. After reviewing the account the approver can approve or deny the request. The registering user will then be notified of the approval status.

Feature: Pre-Approved Domain Names

A list of pre-approved domain names can be defined. When a user registered for access to the site the account will automatically be approved if the registering domain names exists int the pre-approved domain name list.

Feature: Account Verification

When a anonymous user registers for site access a message will be sent to the user's e-mail address asking the user to verify the account. The user can access the site only after verification.

Feature: User Automation Job to Enforce Password Expiration and Account Activity Expiration

ExCM now contains a list of STSADM commands which can be use to create and manage user automation operations such as password expiration and account activity expiration. The job will notify users of pending expirations via e-mail. If a corrective action is not taken the account will be locked out. The age of the lockout and the notification window are customizable using STSADM. You can also customize the notification messages for each event.

Feature: Approved Domain Names

A list of pre-approved domain names has been changed to a list of approved domain names. If the e-mail address of the user is not contained in the list of approved domain names the user will not be allowed to register.

Feature: Web.config Approved Domain Names

Configure globally approved domain names for all sites in the web.config file.

Feature: Limit E-mail to Approved Domain Names During Profile Update

If the site is configured to use approved domain names the e-mail address used during a profile update must belong to one of the approved domain names to succeed.

Symptom: New registration approval email not sent to all Account Approvers

Aproval emails where only sent to the first user listed as an Account Approver. All users with a valid email address in their SharePoint profile will now recieve the alert and be able to Approve or Deny the registration.