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I see a link for "How to get Sugar on an OLPC XO Laptop".

Is this going to revitalize my old XO laptop? (I would really love to be able to do that.)

Your XO shipped with Sugar. Assuming it's an XO-1, the latest OS and installation instructions are here: http://wiki.laptop.org/go/Release_notes/13.2.10#XO-1

It may be a newer version, but Sugar was the initial environment on the XO.