The rotating package provides the sidewaysfigure environment:
and the sidewaystable environment:
If you have used the twoside class option (or you are using a class like scrbook, which defaults to that option) then the sideways floats will be rotated clockwise or anti-clockwise, depending on whether they fall on an even (verso) or odd (recto) numbered page. (Requires a second LaTeX run to get it correct.)
This book is also available as A4 PDF or 12.8cm x 9.6cm PDF or paperback (ISBN 978-1-909440-00-5).