Atlanta, which began January with a six-game winless streak (0-5-1), is gone 2-0-1 since, including Thursday's 1-1 tie with Colorado.
"We're back on track," Thrashers left wing Ilya Kovalchuk said. "We need to win a couple of more games before the All-Star break and we'll be OK."
Atlanta, which boasts the best penalty-killing percentage in the league at home, held Colorado scoreless on five power-play chances.
"This is the best game our defensemen played this year," Atlanta coach Bob Hartley said. "There's no rest playing against these guys. We missed a couple of chances, but I think we generated a lot and we kept their big guns pretty quiet."
The Thrashers have allowed just 10 power-play goals in 116 chances (91.4 percent) at Philips Arena.
The Islanders improved to 3-1-1 in their last five games with Friday's 3-2 win over the Carolina Hurricanes. Trent Hunter had a goal and two assists and Rick DiPietro made 25 saves as New York ended a five-game road winless streak (0-3-2).
"We have no choice but to be desperate and play with a sense of urgency," DiPietro said. "We're closing in on the All-Star break and these are huge points. As a team, we need to learn to win on the road, and this was a good step for us."
With the win, the Islanders moved two points ahead of Atlanta for eighth place in the East.