• To snap to grid, select the items you’re trying to snap, then Edit > Snap Settings
  • For top-down 2d camera, don’t forget to set the camera rotation to X: 90 and Projection: Orthographic (when using the default 3d settings)
  • CreatePlane script: http://wiki.unity3d.com/index.php?title=CreatePlane

…because so far I keep forgetting these two things when trying to set up my project…