In iPhoto if you drag photos to the "Albums" pane it will create a new album. Most people know that already. However, if you hold down option while you drag the pictures to the album pane, it will automatically make a book from those pictures. Pretty slick undocumented iPhoto (OS X only) trick.
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20020319105711224