when creating a glass cube, for example, it is clear, with some depth, but how could it be made to look more real, some of the screenshots you see are amazing, and no matter howmany hours devoted to s simple cube…lol…
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hmmm… is it a question or…?
more seriously, do you aim at realistic glass with blender internal or with yafray? yafray is the most advanced on this topic for now, but not for long if I can believe my eyes: http://wiki.blender.org/bin/view.pl/Blenderdev/FullGIAndSSS
so please be more specific with your question if youu want an answer 
hey yeah 
i guess i should be more specific, i was just in a hurry… thats all lol