I'm just starting out, but:
- Definitive Guide
- The Good Parts
- anything by Resig; currently preprint of the Ninja book.

One huge hole, however.  Most books focus on browser JS, so include the language and the browser (DOM, AJAX).  But JS is Very Quickly taking over all areas of language: server, client, and even communication (JSON).  I'd LOVE a book that took a very wide view of JS-Everywhere.