The Tips - Mac Kung Fu - page 202

Use Quick Look Inside Open/Save Dialog Boxes
If you're opening or saving something and want to see what another file is,
just select it within the Open/Save As dialog box and then hit SPACE to activate
Quick Look, which works within dialog boxes in the same way it does in
Finder windows or on the desktop.
Quick Look Items in a Stack
Quick Look can be used to view items in a Dock stack. Just hover the mouse
over the item and hit SPACE to cause a Quick Look window to pop out, rather
like what appears next to entries in the Spotlight list of results. You can also
highlight the item using the Up/Down cursor keys once the stack has
expanded before you hit SPACE to activate Quick Look.
To learn how to make it slightly easier to know which item the mouse is
hovering over before you use Quick Look, see Tip 148, Add Cool Visual Effects
to Stacks , on page 172 .
Quick Look Attachments and Websites in Mail
Like most elements of OS X, Mail integrates Quick Look. You can use it to
preview attachments in emails or to preview websites that are linked to
within emails—see Figure 32, You can Quick Look just about anywhere,
including within Mail , on page 204 . Simply right-click any attachment, and
select Quick Look Attachment or Quick Look URL from the menu that appears.
Alternatively, you can click the attachment once and then hit SPACE , just like
like when using Quick Look to view a file in Finder or on the desktop. With
web links within a mail message, you can also hover the mouse cursor over
the link until a small down arrow appears. Clicking this will open a Quick
Look window that shows the website.
Quick Look a File via a Gesture
If you have a MacBook with a multitouch trackpad or a Magic Trackpad, you
can instantly use Quick Look to view any file by simply hovering the mouse
cursor over it and then tapping the trackpad with three fingers. You need
only tap, not click—even if you have the tap-to-click function turned off in
System Preferences.
Tapping again with three fingers will quit the Quick Look window, or you can
simply hit ESC or SPACE .