re: Poker & open ended straight draw - how to play it
It all depends on the kind of game you're in. If your opponents are prone to making loose calls, and basically aren't very good at hand reading, then you should lean toward playing your draws passively. Try to get there as cheaply as possible, then work on extracting after you get there.
The reason you play hands like this aggressively, is so that you can still get paid off when you have a strong hand. By playing oesd and flush draws aggressively, anyone paying attention knows you can't always have a hand. They see you playing too many hands fast to always have the goods, and the intent is to open up their range that they'll play against you so you can get more value on monsters. These hands work well because even if you don't get your opponent to fold, you'll still make a very strong hand 1/3 of the time anyway, so your have showdown value to fall back on should your fold equity not work out.
Ultimately, if you can already sit back, play pretty tight, and get called when you bet, then you don't need to get aggro with your draws, since the end goal of getting action on your real hands is already happening.