As you may have seen during last night’s Heroes (a show which has certainly hit a stride of some kind in the past few episodes — it’s gone from low-grade cheesy fun to being genuinely surprising at times, and it — and Sundance‘s Slings and Arrows — are now don’t-erase Tivo staples), NBC.com is previewing seven minutes of Spiderman 3 until 9pm PST this evening, including Aunt May on memory lane, a knock-down, drag-out between Spidey and the Green Goblin II (Harry Osborne/James Franco), and our first official look at Venom.