Just Say Hi
This is a really simple strategy. If you're consistent and persistent with this
strategy, this could yield you a lot of beautiful women. It'll take a long time
though, but then again, it requires almost no effort on your part:) A modification of this tactic (which seems to make some more sense) - just say "Hi" to any girl you like. Yes, any girl and anywhere - the commuter, the street, the airport, the corridor, the cafeteria. Some won't answer (maybe you greeted her too late for her to notice you), some answer, some smile and answer (see also Eye contact experiment), some answer, smile and stop (!) to initiate conversation with you (most probably about how come you know her when she doesn't seem to be able to remember you from anywhere:).
The ones that you have exchanged "Hi"-s with (without ever being introduced to each other or having actually approached her) are the best to use the "We already know each other" tactic with. The next time you meet, just start in the middle, like with an old friend, comment on something/anything etc, she responds and BOOM - you're acquaintances!