Here's a hand I've just played that kinda illustrates what I'm talking about. What are the factors that influence whether I call and try to hit, or play it fast?

I'm OOP = play it fast
Possibility of having the best hand = play fast
Need to eliminate opponents with 2 low spades = play fast
Possibility of calling and encouraging multiway action = play slow, but this applies less to straights, because there's less scope for them to make a second best hand. Argument would apply better with a NFD.

The factors favour playing fast. When it gets checked around and the guy on the button bets, I'm suddenly feeling even better about my hand. So I take the lead here

***** Hand History for Game 5961334153 *****
$400 USD PL Omaha - Saturday, May 12, 08:36:44 ET 2007
Table Table 125432 (No DP) (Real Money)
Seat 5 is the button
Total number of players : 9
Seat 2: Any_97 ( $276.48 USD )
Seat 3: redbull344 ( $419.20 USD )
Seat 4: xhouseofpain ( $64 USD )
Seat 5: skint_101 ( $326.90 USD )
Seat 7: Zerberus666 ( $354 USD )
Seat 9: SMEGVIP ( $456.20 USD )
Seat 10: braquemator ( $218 USD )
Seat 6: HERO ( $232.60 USD )
Seat 1: Hailbopp ( $196 USD )
HERO posts small blind [$2 USD].
Zerberus666 posts big blind [$4 USD].
** Dealing down cards **
Dealt to HERO [ Qc Qh Kc Jd ]
SMEGVIP calls [$4 USD]
braquemator calls [$4 USD]
Hailbopp calls [$4 USD]
Any_97 folds
redbull344 folds
xhouseofpain folds
skint_101 calls [$4 USD]
HERO calls [$2 USD]
Zerberus666 checks
** Dealing Flop ** [ 9s, 3s, Td ]
HERO checks
Zerberus666 checks
SMEGVIP checks
braquemator checks
Hailbopp bets [$22.80 USD]
>You have options at Table 125381 (No DP) Table!.
skint_101 folds
HERO raises [$91.20 USD]
Zerberus666 folds
>You have options at Table 128153 (No DP) Table!.
SMEGVIP folds
braquemator folds
Hailbopp calls [$68.40 USD]
** Dealing Turn ** [ 3c ]
HERO is all-In [$137.40 USD]
Hailbopp folds
HERO does not show cards.
HERO wins $340.80 USD