I had made a simple css hack during the hackathon in Pune to hide the sidebar and slidein on hovering over the left margin.

Its a little crude, but scratches my itch perfectly. My final plan was to reorganize vector using jquery, but this is all I have for now.

Add this to your common.css to try it out:
http://en.wikipedia.org/wiki/User:Planemad/common.css

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Arun Ganesh
(planemad)