Is it possible to align objects in the editor?? For example modular pieces of a road, so there's no overlaping and no gap in between them. Is there a good way to do that?
Unity 2.6 introduced ray snapping, accessible by holding cmd+shift in OS X or ctrl+shift on Windows. While holding those keys and using transform mode (w on the keyboard while focused on Scene view), drag the object from it's center gizmo (the box that appears around the red, green and blue arrows). See this thread for some more detail on the process.