MacBlog

線上版的 Delicious Library？

LibraryThing
Catalog your books online

Easy. Catalog your books online (example); no software required.
Powerful. LibraryThing mines the full Library of Congress catalog, ideal for collectors and scholars.
Free. Enter 200 books for free; enter 20,000 with a $10 lifetime membership.
Tagged. LibraryThing allows blog/Flikr-style tagging (example).
Shared. Find and browse personal libraries like yours.
Or make your library private, only viewable by you.

用的還是 Amazon 的資料庫，可惜的是，中文的書籍幾乎都找不到