I'm not a big fan of O'Reilly books, especially for MS certs. I don't know what others think about them though. I have a couple of good titles by O'Reilly, but not in relation to certifications.
Microsoft Certifications: MCITP:EA, MCSE:S, MCSA:M, MCDST, MCTS: Vista Config, MCITP: Ent Support
Citrix Certifications: CCA XenApp 4.5/5.0 and XenServer 5.0
Other: Marathon Certified Consultant (HA, FT and VM), ISEB InfoSec Management Principles and Security+
Working on: CISSP and Check Team Member
I've heard mixed reviews about that book. From what I can tell, it serves you best as an alternate source, if you've already got the MS Press books. Then again, the All-in-One is a better read, in my opinion. Either that, or you can pick up a set of the Passport Series for the MCSE core exams. I tend to agree with sprkymrk on the O'Reilly series, I don't think it's always what it's cracked up to be. I have collegues who swear by those books, and some who don't think they're worth the paper they're printed on. For me, I've found some that I like, some that I don't, it's all a matter of scouring the bookstore until I find a particular book I like and that I can get something out of.
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Citrix Certifications: CCA XenApp 4.5/5.0 and XenServer 5.0
Other: Marathon Certified Consultant (HA, FT and VM), ISEB InfoSec Management Principles and Security+
Working on: CISSP and Check Team Member
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