I'm kind of playing around with this track right now. Not taking it super serious just yet, but I'm doing a lot of reading/flashcarding. Sadly the amount of books out there pales in comparison to R&S. There's no books that walk you through UCS config/design at all.
NX-OS & Cisco Nexus Switching, 2nd Edition - 15% done
I read most of the 1st ed when it came out. It mostly assumes a lot of previous R&S knowledge and walks you through how to do the same things in NX-OS + the new features.
Cisco Unified Computing System - 67% done
This is just a book about the architecture of UCS itself, nothing in here about configuration or design. A 2nd edition is in the works and a lot of the hardware information in this book is outdated. Brian McGahan said the written has a lot of "useless trivia" type stuff, and this book is full of stuff that could fit that bill.
Introduction to Storage Area Networks - 40% done
Storage networking theory book. Lots of foundation knowledge here that can't be skipped.
I/O Consolidation in the Data Center - unread
This looks like an FCoE theory book and is very short at 168 pages.
Data Center Virtualization Fundamentals - unread
Not sure if I will read this or not. It looks like it covers all of the systems in the modern data center, some use cases and problems that are trying to be solved. It might be a good overview book.
I've also gone through about 25% of the INE videos on Nexus, Storage and UCS. If I were giving a recommendation to someone just starting, I'd say go through and learn/lab on the Nexus/Storage stuff first before you jump into UCS.
And speaking of labbing, the new rack rental system INE has is awesome now (except for picking the actual time which is kind of clunky). Looks like you can rent in a block of time as short as 30 minutes. If you pick out a large block of time, like 4 hours, it will let you know if certain slots are booked but still give you a screen to book the hours that are free. Looks like this is doing a lot to fix the overcrowding on the DC racks since I can actually book time each day. Gonna book an hour during my lunch break today to get my feet wet.