Pat salmon dry with paper towel. Toss cubes with olive oil, salt, and freshly ground black pepper until evenly coated.
Heat skillet over medium-high heat or set broiler to high. Sear salmon cubes 1 to 2 minutes per side, turning occasionally until coloured on two or three sides (or broil 3 to 4 minutes total, turning once), until just cooked through and lightly golden on the edges. Avoid overcooking—centre should still look slightly translucent when removed from heat, as it will continue cooking briefly.
While salmon cooks, whisk together maple syrup, gingerroot, and orange zest in small bowl.
As soon as salmon comes off the heat, brush each piece lightly with maple-ginger mixture. Skewer each bite with small pick and arrange on serving platter. Scatter chives over top just before serving.