The My Widgets feature has been renamed Widgets and Live Text.
For the Notes and Domino release 8.0 stream, including 8.0.1 and 8.0.2 and so on, the Widgets and Live Text documentation for the administrator, power user/app dev, and end user is in the Domino Administrator help infocenter in Configuring and using Widgets and Live Text.
You can get there this way too:
1. Go to http://publib.boulder.ibm.com/infocenter/domhelp/v8r0/index.jsp.
2. Open the "Domino Administrator Help" link in the navigator panel.
3. Open the "Configuring and using Widgets and Live Text" section of the table of contents.
Also note that as of Notes 8.5, power user and end user Widgets and Live Text help is resident in the embedded Notes client user help. Administrator help for Widgets and Live text remains resident in Domino Administrator help.