for those people who also wish to be able to search "B&N", "books by isbn" (great site for covers) or goodreads and have them on the search the Internet plugin, here is what I added to the tweaks section.
Let's be honest here, the goodreads links are a must :-)
I have added the icons just add them in he calibre/resources/images folder
Code:
# Specify the submenus to appear on the 'Search the internet' plugin menu.
# Menu items are specified as a triple of: ('Menu text', 'Image', 'Url')
# 'Menu text' - The name to display in the sub-menu. Specify None for a separator.
# 'Image' - Name of the image file to use as a menu icon. Specify None if no image.
# Image .png files should be placed in the \resources\images folder.
# 'Url' - URL of the website to launch, with tokens that are substituted
# when the menu item is click based on the currently selected book.
# The possible token values you can place in the URL are:
# {title} - The title for the first selected book
# {author} - The author for the first selected book
# {isbn} - The ISBN for the first selected book
stip_search_internet_menus = [
('FantasticFiction for Author', 'stip_fantastic_fiction.png', 'http://www.fantasticfiction.co.uk/search/?searchfor=author&keywords={author}'),
('FantasticFiction for Title', 'stip_fantastic_fiction.png', 'http://www.fantasticfiction.co.uk/search/?searchfor=book&keywords={title}'),
(None, None, None),
('Amazon.com for Book', 'stip_amazon.png', 'http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dstripbooks&field-keywords={author}+{title}'),
(None, None, None),
('Barnes and Noble by isbn', 'stip_bn.png', 'http://search.barnesandnoble.com/books/product.aspx?EAN={isbn}&page=index&prod=univ&choice=allproducts&query={isbn}&flag=False&ugrp=1'),
('Barnes and Noble by Author', 'stip_bn.png', 'http://productsearch.barnesandnoble.com/search/results.aspx?store=EBOOK&WRD={author}&box={author}&pos=-1&ugrp=1'),
('Barnes and Noble by Title', 'stip_bn.png', 'http://productsearch.barnesandnoble.com/search/results.aspx?store=EBOOK&WRD={title}+by+{author}'),
(None, None, None),
('Books by isbn for cover', 'stip_isbn.png', 'http://books-by-isbn.com/cgi-bin/isbn-lookup.pl?isbn={isbn}'),
(None, None, None),
('Book on Goodreads', 'stip_gr.png', 'http://www.goodreads.com/search/search?q={isbn}&group_id=&search_type=books'),
('Author on Goodreads', 'stip_gr.png', 'http://www.goodreads.com/search/search?q={author}&group_id=&search_type=books'),
(None, None, None),
('Google.com for Book', 'stip_google.png', 'http://www.google.com/#sclient=psy&q={author}+"{title}"'),
('Google images for Book', 'stip_google.png', 'http://www.google.com/images?q={author}+{title}'),
(None, None, None),
('Wikipedia for Author', 'stip_wikipedia.png', 'http://en.wikipedia.org/w/index.php?title=Special%3ASearch&search={author}')]