If it is not too late, here's a few more links that I use. I'm not sure if the Audible links would be appropriate for everyone, but I use Calibre to track my audio books as well (and apparently I'm not alone according to another recent thread "
audio books in calibre")
Code:
('Kobo for Author', 'stip_kobo.png', 'http://www.kobobooks.com/search/search.html?q={author}&t=all&f=author&p=1&s=numpurchases&g=both','utf-8', None),
('Kobo for Title', 'stip_kobo.png', 'http://www.kobobooks.com/search/search.html?q={title}&','utf-8', None),
('Inkmesh for Book', 'stip_inkmesh.png', 'http://www.inkmesh.com/search/?qs={title}+by+{author}&btnE=Find+Ebooks','utf-8', None),
('Audible for Author', 'stip_audible.png', 'http://www.audible.com/search?advsearchKeywords=&searchTitle=&searchAuthor={author}&searchNarrator=&searchProvider=&field_subjectbin=&field_content_type-bin=&field_format-bin=&field_price=&field_product_site_launch_date=&field_runtime=&field_language=English&x=0&y=0','utf-8', None),
('Audible for Book', 'stip_audible.png', 'http://www.audible.com/search?advsearchKeywords=&searchTitle={title}&searchAuthor={author}&searchNarrator=&searchProvider=&field_subjectbin=&field_content_type-bin=&field_format-bin=&field_price=&field_product_site_launch_date=&field_runtime=&field_language=English&x=0&y=0','utf-8', None),