Updated for Safari 4
Did you know that you can create
separate windows from Safari tabs or merge open windows
into one tabbed Safari window? It's easy to do in
Safari 3 or Safari 4 for Mac OS X.
If you want to view a tab in a separate window instead
of in the current window, select "Move Tab to New
Window" from the Window menu and a new window will open
with just the selected web page. You can also move a
tab to a new window by dragging the tab out of the Tab
bar and into the main Safari window.
To combine several open windows into one tabbed window,
select "Merge All Windows" from the Window menu and all
open web pages will be placed in tabs in one
window.