- Play very tight early on and observe. Reads don't become crucially important in a SnG until blind stealing becomes an issue (usually at something like 50/100 blinds and beyond, this will vary a little according to the table you're at, the blind structure etc), as in the early stages you should just be treating the game as a ring game for the most part and playing your cards and odds more than playing your opponents.
- Get Pokertracker and PAHud/Gametime. Helps hugely with general reads on players (who is seeing a lot of flops, who is a calling station, who bets out on a lot of flops etc)
- Take notes on the players. Someone raised in early position with 93o? Note it. Someone only cold-called a small raise with AK? Note it. Someone limp-reraised AA from early position? Note it. Someone has repeatedly slowplayed big hands? Note it. Someone made a checkraise semibluff with a flush draw? Note.... you get the point.