The new flick 500 Days of Summer, which generated much buzz as the 2009 Sundance Film Festival, rolls out in limited release today. Lot’s of people are talking about it as a romantic comedy meets Memento which in film terms means that those with ADD or short attention spans might be confused by this rambunctious romantic romp. But for us, the buzz doesn’t just lie in the zigzagging sex talk but rather in the architecture talk. Even more specifically in the Green architecture talk.