At I Annotate this weekend, I made a bookmarklet that will allow you to generate an Annotag from a book’s bibliographic entry:
To use it:
:p26
.The bookmarklet extracts book identifiers from your URL, encodes it in base-62, and takes you to Twitter, where this information will be be waiting for you, encoded as a hashtag. Now it’s even easier to tweet about books!
If you’d like to help improve the code, it can be found here on GitHub.