diff --git a/model/ArrayList.php b/model/ArrayList.php
index e05e3dff3..f62bac282 100644
--- a/model/ArrayList.php
+++ b/model/ArrayList.php
@@ -21,6 +21,10 @@ class ArrayList extends ViewableData implements SS_List {
 		return count($this->array);
 	}
 
+	public function exists() {
+		return (bool) count($this);
+	}
+
 	public function getIterator() {
 		return new ArrayIterator($this->array);
 	}
@@ -52,7 +56,7 @@ class ArrayList extends ViewableData implements SS_List {
 	}
 
 	public function add($item) {
-		$this->array[] = $item;
+		$this->push($item);
 	}
 
 	public function remove($item) {
@@ -61,6 +65,67 @@ class ArrayList extends ViewableData implements SS_List {
 		}
 	}
 
+	/**
+	 * Replaces an item in this list with another item.
+	 *
+	 * @param array|object $item
+	 * @param array|object $with
+	 */
+	public function replace($item, $with) {
+		foreach ($this->array as $key => $candidate) {
+			if ($candidate === $item) {
+				$this->array[$key] = $with;
+				return;
+			}
+		}
+	}
+
+	/**
+	 * Merges with another array or list by pushing all the items in it onto the
+	 * end of this list.
+	 *
+	 * @param array|object $with
+	 */
+	public function merge($with) {
+		foreach ($with as $item) $this->push($item);
+	}
+
+	/**
+	 * Pushes an item onto the end of this list.
+	 *
+	 * @param array|object $item
+	 */
+	public function push($item) {
+		$this->array[] = $item;
+	}
+
+	/**
+	 * Pops the last element off the end of the list and returns it.
+	 *
+	 * @return array|object
+	 */
+	public function pop() {
+		return array_pop($this->array);
+	}
+
+	/**
+	 * Unshifts an item onto the beginning of the list.
+	 *
+	 * @param array|object $item
+	 */
+	public function unshift($item) {
+		array_unshift($this->array, $item);
+	}
+
+	/**
+	 * Shifts the item off the beginning of the list and returns it.
+	 *
+	 * @return array|object
+	 */
+	public function shift() {
+		return array_shift($this->array);
+	}
+
 	public function first() {
 		return reset($this->array);
 	}
diff --git a/tests/model/ArrayListTest.php b/tests/model/ArrayListTest.php
index c8ba216f2..bb13dc0ed 100644
--- a/tests/model/ArrayListTest.php
+++ b/tests/model/ArrayListTest.php
@@ -12,6 +12,13 @@ class ArrayListTest extends SapphireTest {
 		$this->assertEquals(3, $list->count());
 	}
 
+	public function testExists() {
+		$list = new ArrayList();
+		$this->assertFalse($list->exists());
+		$list = new ArrayList(array(1, 2, 3));
+		$this->assertTrue($list->exists());
+	}
+
 	public function testToNestedArray() {
 		$list = new ArrayList(array(
 			array('First' => 'FirstFirst', 'Second' => 'FirstSecond'),
@@ -51,6 +58,72 @@ class ArrayListTest extends SapphireTest {
 		));
 	}
 
+	public function testReplace() {
+		$list = new ArrayList(array(
+			array('Key' => 1),
+			$two = (object) array('Key' => 2),
+			(object) array('Key' => 3)
+		));
+
+		$this->assertEquals(array('Key' => 1), $list[0]);
+		$list->replace(array('Key' => 1), array('Replaced' => 1));
+		$this->assertEquals(3, count($list));
+		$this->assertEquals(array('Replaced' => 1), $list[0]);
+
+		$this->assertEquals($two, $list[1]);
+		$list->replace($two, array('Replaced' => 2));
+		$this->assertEquals(3, count($list));
+		$this->assertEquals(array('Replaced' => 2), $list[1]);
+	}
+
+	public function testMerge() {
+		$list = new ArrayList(array(
+			array('Num' => 1), array('Num' => 2)
+		));
+		$list->merge(array(
+			array('Num' => 3), array('Num' => 4)
+		));
+
+		$this->assertEquals(4, count($list));
+		$this->assertEquals($list->toArray(), array(
+			array('Num' => 1), array('Num' => 2), array('Num' => 3), array('Num' => 4)
+		));
+	}
+
+	public function testPushPop() {
+		$list = new ArrayList(array('Num' => 1));
+		$this->assertEquals(1, count($list));
+
+		$list->push(array('Num' => 2));
+		$this->assertEquals(2, count($list));
+		$this->assertEquals(array('Num' => 2), $list->last());
+
+		$list->push(array('Num' => 3));
+		$this->assertEquals(3, count($list));
+		$this->assertEquals(array('Num' => 3), $list->last());
+
+		$this->assertEquals(array('Num' => 3), $list->pop());
+		$this->assertEquals(2, count($list));
+		$this->assertEquals(array('Num' => 2), $list->last());
+	}
+
+	public function testShiftUnshift() {
+		$list = new ArrayList(array('Num' => 1));
+		$this->assertEquals(1, count($list));
+
+		$list->unshift(array('Num' => 2));
+		$this->assertEquals(2, count($list));
+		$this->assertEquals(array('Num' => 2), $list->first());
+
+		$list->unshift(array('Num' => 3));
+		$this->assertEquals(3, count($list));
+		$this->assertEquals(array('Num' => 3), $list->first());
+
+		$this->assertEquals(array('Num' => 3), $list->shift());
+		$this->assertEquals(2, count($list));
+		$this->assertEquals(array('Num' => 2), $list->first());
+	}
+
 	public function testFirstLast() {
 		$list = new ArrayList(array(
 			array('Key' => 1), array('Key' => 2), array('Key' => 3)