Arrange Menu

 Bring Forward

⌥⌘F

Moves selected object up one level.

 Bring to Front 

⇧⌘F

Moves selected object to front-most level.

 Send Backward 

⌥⌘B

Moves selected object down one level.

 Send to Back 

⇧⌘B

Moves selected object to back-most level.

 Lock 

⌘L

Locks current shape to prevent editing.

 Unlock 

⌥⌘L

Unlocks currently locked shape.

 Group 

⇧⌘G

Groups currently selected shapes so they are treated as a single object.

 Ungroup 

⇧⌘U

Ungroups the currently selected group. You can ungroup several times if you have subgroups within a larger group.

 Align 

▶

 Align Left Edges   
 Align Right Edges   
 Align Top Edges   
 Align Bottom Edges   
 Align Vertical Centers   
 Align Horizontal Centers 
 Make Centered Row 
 Make Centered Column 

Align Left Edges aligns selected objects by their left edges.
Align Right Edges aligns selected objects by their right edges.
Align Top Edges aligns selected objects by their top edges.
Align Bottom Edges aligns selected objects by their bottom edges.
Align Vertical Centers aligns selected objects by their vertical centers.
Align Horizontal Centers aligns selected objects by their horizontal centers.
Make Centered Row aligns selected objects by their horizontal centers and spaces them by the horizontal value specified in the Alignment inspector.
Make Centered Column aligns selected objects by their vertical centers and spaces them by the vertical value specified in the Alignment inspector.

 Grid 

▶

 Snap to Grid  ⌘[
 Align Graphics To Grid  ⌥⌘[

Snap to Grid toggles whether objects snap to the grid in the active document.
Align Graphics To Grid aligns selected graphics to the grid.

 Automatic Layout 

▶

 Layout Entire Graph   
 Layout Selection   

Layout Entire Graph lays out the entire active canvas using the layout specified in the Automatic Layout inspector.
Layout Selection lays out the currently selected objects using the layout specified in the Automatic Layout inspector.

 Mouseless Editing 

▶

 Select Shape Left  ⌘←
 Select Shape Right  ⌘→
 Select Shape Above  ⌘↑
 Select Shape Below  ⌘↓
 Create Shape Left  ⌥⌘←
 Create Shape Right  ⌥⌘→
 Create Shape Above  ⌥⌘↑
 Create Shape Below  ⌥⌘↓
 Create Connected Shape Left  ⌃⌘←
 Create Connected Shape Right  ⌃⌘→
 Create Connected Shape Above  ⌃⌘↑
 Create Connected Shape Below  ⌃⌘↓
 Create Child and Layout  ⌥⌘;
 Create Sibling and Layout  ⌥⌘'

Select Shape Left selects the next shape to the left of the currently selected shape.
Select Shape Right selects the next shape to the right of the currently selected shape.
Select Shape Above selects the next shape above the currently selected shape.
Select Shape Below selects the next shape below the currently selected shape.
Create Shape Left creates a duplicate of the currently selected shape to the left of the current shape.
Create Shape Right creates a duplicate of the currently selected shape to the right of the current shape.
Create Shape Above creates a duplicate of the currently selected shape above the current shape.
Create Shape Below creates a duplicate of the currently selected shape below the current shape.
Create Connected Shape Left creates a duplicate of the currently selected shape to the left of the current shape and connects the two shapes.
Create Connected Shape Right creates a duplicate of the currently selected shape to the right of the current shape and connects the two shapes.
Create Connected Shape Above creates a duplicate of the currently selected shape above the current shape and connects the two shapes.
Create Connected Shape Right creates a duplicate of the currently selected shape below the current shape and connects the two shapes.
Create Child and Layout creates a child of the currently selected shape and performs a hierarchical layout on all connected shapes.
Create Sibling and Layout creates a child of the currently selected shape and performs a hierarchical layout on all connected shapes.

When creating new shapes or selecting shapes, if you are in text editing mode on the current shape, you will also be in text editing mode in the newly created shape or newly selected shape. This allows you to quickly edit the text on all of your shapes.