The Pools section at the bottom of the Runner grid for each race shows the current total of money invested in each of the bet type Pools operating on the Race.
Most betting occurs in the few minutes prior to the start of the race, so these totals grow considerably as the Race start draws closer.
NTD on a Place Pool means that a dividend for the 3rd placed runner will not be available. This is usually due to less than eight runners starting in the race.
Multi-leg Pools (e.g. Doubles, etc.) show the Pool total on the 1st Leg only. Final results for these Pools show on the last Leg.
Jackpots carried over from previous races can bolster Pool totals. Keep an eye out for these!