We've just pushed a much requested improvement to our generic unsubscribe pages live. Whenever a recipient unsubscribes from one of your lists, the confirmation page now includes:

• The email address that was removed.
• A re-subscribe link so if the single-click unsubscribe link was clicked accidentally (it's amazing how many people click it to "see what happens"), the recipient can re-subscribe to the list with a single-click.

Of course, you can still use your own unsubscribe confirmation pages to keep the entire process transparent. If you're keen to implement your own version of the re-subscribe option, check out this tip and this method in our API.