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I realise this is an old question but I just received a link that might be of interest: http://www.popsci.com/technology/article/2011-05/bernoulli-bots-supersonic-air-jets-allow-it-climb-just-about-surface
You could always try google (hint hint, google it!)
Take a simple wheeled robot and replace tires with suction cups. If it is light enough it should be capable of climbing a glass wall.