Here is the list of e-book that you can use to sharpen your knowledge. Please DO NOT ask me for the url links or anything like that.
Most of these books are contains Junos CLI hands-on material, you can use it to learn Junos. Some books are contains IP knowledges that you can use in the global IP design and not only to single vendor.
1. John Wiley and Sons MPLS Enabled Applications Emerging Developments and New Technologies. (June 2008)
2. The Illustrated Network: How TCP/IP Works In A Modern Network (Walter Goralski 2008)
3. JUNOS For Dummies (Feb 2008)
4. OReilly JUNOS Cookbook (Apr 2006).
5. OReilly JUNOS Enterprise Routing (Mar 2008).
6. Wiley,. Designing and Developing Scalable IP Networks (2004)
7. Addison-Wesley, OSPF and IS-IS Choosing an IGP for Large-Scale Networks (2005)
8. Addison Wesley – Interdomain Multicast Routing – Practical Juniper Networks and Cisco Systems Solutions (Apr 2002)
9. Wiley,. Juniper and Cisco Routing – Policy and Protocols for Multivendor IP Networks (2002)
9. The Complete ISIS Routing Protocols (May 2008)
10. Sybex book for JNCIA, JNCIS, JNCIP and JNCIE <— free ebook.
11. Prentice Hall Broadband Network Architectures (May 2007) <– E-Series
12. Exploring the Junos CLI <— free ebook
13. Addison Wesley – Juniper Networks Reference Guide – JUNOS Routing, Configuration, and Architecture (Oct 2002).
14. Juniper Networks Field Guide And Reference (Oct 2002).
Another good books
1. Deploying IP and MPLS QoS for Multiservice Networks: Theory & Practice (The Morgan Kaufmann Series in Networking) by John William Evans and Clarence Filsfils (Hardcover – Mar 23, 2007).
2. OSPF: Anatomy of an Internet Routing Protocol by John T. Moy (Paperback – Feb 12, 1998)
3. OSPF Complete Implementation (paperback) by John T. Moy (Paperback – Jun 22, 2008)
4. Internet Routing Architectures (2nd Edition) (Networking Technology) by Sam Halabi (Hardcover – Sep 2, 2000)
Some books is already old and contains old material.
Please update me if you have another good book to share 
