Google made it easy to embed in a site any book available at Google Book Search. You can add a fully-functional widget using this code:
<script type="text/javascript" src="http://books.google.com/books/previewlib.js"></script> <script type="text/javascript"> GBS_insertEmbeddedViewer('GkCpLIk7aisC',600,500); </script>where you should replace GkCpLIk7aisC with the corresponding book ID
Sehr feine Funktion, da es mittlerweile wirklich ein Sack an Büchern bei den Jungs von Google gibt.