ToB Spoiler
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There are three different types of Special Ability Traps.
Spike Trap: The most popular, attacks one target and deals 20D6 damage.
Exploding Trap: Like it says, it explodes like a fireball and deals 10D6 fire damage to all targets in its area of effect, targets must also make a saving throw or be knocked unconsicious.
Time Stop Trap: When triggered, a mini Time Stop occurs for the Thief/Bard for 10 seconds, this is very good for multiclassed Fighter-Thieves, Thief-Mages, etc... because they can do a lot of things in 10 seconds.
Not so good for pure Thieves, because they usually only have 1-3 attacks per round.