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Yes! Right-click your desktop, and then select "Gadgets". This brings up the sidebar and the sidebar options.
How to make your twitter sidebar invisible...
http://louise-lloyd.com/geek/twitter-transparent-sidebar/
All-in-One Sidebar was created in 2005.
You will not get a windows vista sidebar but if you install google desktop, it comes with a sidebar which is similar to vista sidebar. It has an equal or more number of widgets compared to vista.
Make the sidebar of a fixed length.