Hotkeys to move components up/down in Inspector?

As of this moment, Unity has not implemented such mechanics. There may hotkeys for other similar actions, but as for reordering the components, the closest you'll be be able to get is this:

http://u3d.as/content/man-on-edge/component-reorder/2Zb

Hope this helps!

This plugin does exactly that in the most possible intuitive way

http://forum.unity3d.com/threads/released-component-tool-panel-compact-seamlessly-intergated-component-utils.404588/

FYI although there isn't a builtin hotkey, you can add and reorder components as a multi-edit operation, which makes all the difference if you have to do this for several objects at once.

You can use MenuItem and the undocumented UnityEditorInternal.ComponentUtility.MoveComponentUp/Down to make your own hotkeys.

For example to create a menu with hotkey shift-alt-u use something like:

 [MenuItem("MyMenu/Component Up #&u")]
 static void MoveUp()
 {
     var sel = Selection.activeGameObject;
     var target_component = sel.GetComponent<MoveThisKindOfComponent>();
     UnityEditorInternal.ComponentUtility.MoveComponentUp(target_component);
 }

But as far as I know, Unity doesn't have a concept of currently selected component, so you'd have to find some way to specify which component type to move. If you made an Editor, you could have an ObjectField :

 m_ComponentType = EditorGUILayout.ObjectField("Move Component:", m_ComponentType, typeof(MonoScript), allowSceneObjects: false) as MonoScript;
 var target_component = sel.GetComponent(m_ComponentType.GetClass());

That editor might be a good place for your MenuItem to live.