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The wielder's Speed is boosted by one stage at the end of each turn. Speed Boost will not activate at the end of the turn that the wielder switches in.
This ability single-handedly sent Blaziken from solidly UU in DPP to Uber in BW. It is a great ability but unfortunately the Pokemon who have it now are not really equipped to abuse it. Sharpedo has brute force on its side but it neither has the movepool nor the bulk to use it well. Yanmega is strong but it has Tinted Lens as another great ability. You will see it but not as much as you would expect now that Blaziken is gone.
It should be noted that Speed Boost is one of the factors that makes Ninjask stand out as a Baton Pass user, as all the Speed boosts accumulated while it is on the field can be passed on, thus making it easy to pass a couple of Speed boosts on if your opponent does not have a phazer or a Pokemon with Taunt; if they do, however, Ninjask tends to die very quickly.
Found in Dream World