Four more quick ones from my $250k notebook:
1) Small talk is big talk. Do not fuck it up, do not ignore it. It is just as worthy of practice as your STARR model and your handshake.
2) Weak ties are more valuable than strong ties. They enable you to reach further outside your current circle.
3) "Good to meet you" needs to be more than just a phrase. You need to be genuinely happy to meet them. Laughter is key. Whether that means boozing it up a little or keeping Failbook up on your phone (my personal secret weapon), find a way to make it happen no matter what kind of day you've had.
And the big one....
4) The Ben Franklin paradox: "He that has once done you a Kindness will be more ready to do you another, than he whom you yourself have obliged."
In short, if you can get someone you don't know very well to do you a favor, they will like you slightly more than they originally did. If you wait a little while and ask them for another favor, they're more likely to do it, because they now like you.
Two reasons for this:
1) Self-justification. "I don't want to be a dick and say no, so I'll do the favor even though I don't know this guy." Five minutes later: "Why did I do him that favor? Must have been because I liked him."
2) Payback. "That guy owes me a favor. I think I'll stay on his radar."
Then, when you actually do return the favor, you've shown reciprocity... the foundation of relationships on Wall Street.