1) Choose either Code or Split view in the Document Toolbar.
2) Through the View drop down menu. (View > Code).
3) Choose Coder in the Workspace Switcher Menu.
Choose New Workspace in the Workspace Switcher Menu.
Mac - 10.6.4 - DW CS5
Save a document - Cmd | S
Preview document in secondary browser - Cmd | F12
Check spelling - Shift | F7
View page properties - Cmd | J
Use sub-folders to separate different types of supporting files into easily manageable libraries of assets. Label them accordingly, for example "css", or "video", or "assets".