Don't ever limp

In general, far too many people limp in in early tournament play. The only excuse for limping - particularly in early position - is as the first part of a limp-reraise play. Other than that, you should only limp with a hand that you'd be willing to call a raise with. And there aren't many of those given that with tournament poker there is the gap rule, which says that you should call a raise only with a hand better than that with which you'd be willing to make the same raise.

Full Tilt Poker Game #_: $10 + $1 Sit & Go (_), Table 1 - 20/40 - No Limit Hold'em - 22:34:09 ET - 2008/05/06
Seat 1: (1,400)
Seat 2: (2,170)
Seat 3: (1,260)
Seat 4: (2,445)
Seat 5: (525)
Seat 6: (3,180)
Seat 8: (1,270)
Seat 9: hero (1,250)
Seat 1 posts the small blind of 20
Seat 2 posts the big blind of 40
The button is in seat #9
*** HOLE CARDS ***
Dealt to hero [Ad 4d]
Seat 3 calls 40
Seat 4 calls 40
Seat 5 calls 40
Seat 6 calls 40
Seat 8 calls 40

Come on. Everybody limping? None of that!

hero raises to 340
Seat 1 folds
Seat 2 folds
Seat 3 folds
Seat 4 folds
Seat 5 folds
Seat 6 folds
Seat 8 folds

Uh huh.

Uncalled bet of 300 returned to hero
hero mucks
hero wins the pot (300)
*** SUMMARY ***
Total pot 300 | Rake 0
Seat 1: (small blind) folded before the Flop
Seat 2: (big blind) folded before the Flop
Seat 3: folded before the Flop
Seat 4: folded before the Flop
Seat 5: folded before the Flop
Seat 6: folded before the Flop
Seat 8: folded before the Flop
Seat 9: hero (button) collected (300), mucked