General purpose AS3 Object Pool class

ObjectPool.as

package
{  
  /**
	 * ObjectPool Class
	 * @author Julian
	 */
	public class ObjectPool
	{
		private var _list:Array;
		
		public function ObjectPool(object_type:Class, qty:uint)
		{
			for (var i:int = 0; i < qry; i++) 
			{
				_list.push( new object_type() );
			}
		}
		
		public function getNextObject():*
		{
			var obj:* = _list.shift();
			_list.push(obj);
			return obj;
		}
	
	}
 
}

Usage:

var enemyPool:ObjectPool = new ObjectPool( Enemy, 15 );
// later on
var enemy:Enemy = enemyPool.getNextObject() as Enemy;

If you want the object pool to be globally accessible, you don't need static methods.
You can create a package-level variable like this:

// EnemyPool.as (file must be named like this, afaik)
package
{
  public var EnemyPool:ObjectPool = new ObjectPool( Enemy, 15 );
}

// later on, from anywhere in your code...

var enemy:Enemy = EnemyPool.getNextObject() as Enemy;

This way you can create many different instances of ObjectPool for different entities in your game without duplicating your code.

Nice one! There's a typo on line 13, qry instead of qty :)