Sidebar - Google Docs

I have been using Remember The Milk and its excellent Remember The Milk for Gmail extension for Firefox in conjunction with Google Calendar for awhile now. The extension allows me to add and track tasks from within Gmail, and RTM has a Gcal calendar that that lets me view tasks in Google Calendar. However, there are times when I would like to view my tasks and agenda while viewing some other web page. I have experimented with some Sidebar options.