Treehugger has this entry about a very exciting new technology that could make harnessing the energy of the sun not just easier, but also in keeping with the glass framed esthetics of modern buildings: http://www.treehugger.com/files/2008/12/solar-photovoltaic-window-system-rsi-solar.php A company called RSI Solar has developed windows that are transparent like normal glass windows and which convert sunlight falling on them into electricity. I can see how valuable this would be in the huge software complexes that are being built all over India not to mention large office blocks which try to mimic buildings in North America if the owners of the buildings were to replace their regular windows with these. And there is an additional benefit - these windows would also reduce heating inside and make the demand for power required for airconditioning smaller. All in all an excellent option for improving energy efficiency while keeping the appearance of buildings conventional.
RSI Solar's website is: http://www.solar.tm/ Do check the link out.