I figured I would put some of the resources I found over the past couple of months when I was learning about how Junos works vs IOS. Hard to beat being a Juniper newbie and having a pretty vast amount of resources to get one started, I don't recall anything of the sort when I got started with Cisco
Complete List - Juniper Technical Education Courses
This is just a brief list of some of the more general eLearning courses which Juniper offers free of charge that I thought were general enough to be a good starting point for a novice. Some of these are somewhat brief or don't go into a whole lot of detail and often assume you have prior networking experience covering some of the basics. Overall I thought some of them were a decent primer before I hit the books.
Junos as a Second Language
Junos as a Second Language - Podcast Version
Junos as a Scripting Language
Junos as a Security Language
Junos as a Security Language - Podcast Version
Junos as a Switching Language
Junos as a Switching Language - Podcast Version
Juniper Fast Track Program
Juniper Fast Track Portal
This one has been mentioned in the forum here many times but it's a great resource. Register for an account if you haven't already done so and available to you are a variety of study guides which they use in some of their instructor led training courses. Juniper doesn't provide the lab guides and topology diagrams which would be included if you took the instructor led course but the student guides which you are given access to are good to have at least.
If you do desire to obtain the lab guides and topology diagrams (along with any other guides/booklets a student attending an instructor led course would receive), you can now order them through Juniper's New Education Services Bookstore
Juniper's Day One Booklets
Free Juniper Day One Booklets
I thought these were especially nice since they catered well to my interest becaues they included many of them in the mobi format (in addition to PDF) which works a lot smoother on my Kindle!
Essentially this is just a collection of various e-books covering the Junos CLI, Junos basics, monitoring/troubleshooting, and on further into more advanced or specific technologies.
J-Net Discussion Forums
Not as much of a direct training resource, but still a lot of good information to be found here as you work your way through new territory. Not that the great minds who participate here aren't helpful - they are! Just that there is a lot more traffic over at there forums and as a result - more information.
Free Practice Exams
Juniper Networks Technical Certification Program
Last but not least, I figured I would toss this one in here too. Obviously it's the wise choice for one to look over if they are pursuing a particular certification so one can view the exam objectives, prerequisites, etc. They don't include them for each exam, but some of the certification tracks had practice exams available. I'm pretty sure it's only Service Provider and Enterprise Routing and Switching - perhaps they will add more, perhaps not but these two are out there at least.