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According to the Universal monster rules, a swarm's damage occurs at the end of their move:
Swarm Attack: Creatures with the swarm subtype don't make standard melee attacks. Instead, they deal automatic damage to any creature whose space they occupy at the end of their move, with no attack roll needed. Swarm attacks are not subject to a miss chance for concealment or cover. A swarm's statistics block has “swarm” in the Melee entry, with no attack bonus given. The amount of damage a swarm deals is based on its Hit Dice, as shown below.
By RAW, this would mean that they end a move (action?), they deal swarm damage to whatever occupies the same spaces.
If one were to have a swarm intelligent enough to understand complex tactics, would they take advantage of their unique abilities by readying a move action to move on top of whatever may try to escape from their square? By doing so, could they possibly apply swarm damage twice in the same round to one or more targets?
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Sounds legit since readying doesnt prevent you from moving. although i would probably just make it once per turn as otherwise it is very silly. It gets worse if its a tick swarm, they cling to you if you leave their area, potential 3x damage ... and they do con damage.
Cling (Ex)
If a creature leaves a tick swarm’s square, the swarm takes 1d6 points of damage to reflect the loss of its numbers as several ticks cling to the victim. A creature with ticks clinging to it takes swarm damage at the end of its turn each round. As a full round action, the creature can remove the ticks with a DC 20 Reflex save. At least 10 points of damage from any area effect destroys all clinging ticks. The save DC is Dexterity-based.
Note that its a full round action to remove the clinging ticks, and they have the distract ability.