Killstreaks in Black Ops comes with 15 options from a Spy Plane to ana Gunship and many others in between including Attack Dogs and a Napalm Strike.
Sam Turret
Airdrop a placeable SAM turret that destroys aircraft.
Required: 4 Kills
Unlocked: 1600 Points
Mortar Team
Target three locations to bombard with Mortar Strikes.
Required: 6 Kills
Unlocked: 3200 Points
Blackbird
Shows both enemy position and direction on the mini-map. Cannot be shot down.
Required: 8 Kills
Unlocked: 4500 Points