Tomcat 7.0 has changed its manager URL's, and with the tomcat 7.0 branch now declared stable this might impact a lot of users real soon (hence the priority)

The deploy plugin tries to go to /manager/list and is greeted with a 404.

On further inspection, the 404-page does provide some more information:
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The page you tried to access (/manager/list) does not exist.

The Manager application has been re-structured for Tomcat 7 onwards and some of URLs have changed. All URLs used to access the Manager application should now start with one of the following options:

• /manager/html for the HTML GUI
• /manager/text for the text interface
• /manager/jmxproxy for the JMX proxy
• /manager/status for the status pages

Note that the URL for the text interface has changed from "/manager" to "/manager/text".

You probably need to adjust the URL you are using to access the Manager application. However, there is always a
chance you have found a bug in the Manager application. If you are sure you have found a bug, and that the bug has not already been reported, please report it to the Apache Tomcat team.