Enforcement of the sales ban required that Apple post a $2.6 million bond from which damages to Samsung would be paid if Apple ultimately lost its infringement case, and FOSS Patents reports that Apple has indeed moved quickly to post the bond.
Apple didn't hesitate to post its $2.6 million bond to protect Samsung againt the possibility of a successful appeal, in which case the preliminary injunction would be found to have been improperly granted. [...]Samsung has filed a request for a stay of the injunction while it appeals the decision, but for the time being Samsung is subject to the ban.
On this basis, the injunction has taken effect and Samsung must abide by it. Otherwise Apple could ask the court to sanction Samsung for contempt.
The ban only applies to the Galaxy Tab 10.1, and Samsung now offers several other tablet models that are not affected by the injunction, so it is unclear exactly how much of an economic effect the ban will have on Samsung. But the injunction does strengthen Apple's standing as it pursues this and other lawsuits against Samsung in courts around the world.