So, what are we talking about when we say "Core Services" in Longhorn Server? These are the features that are core to the operating system and are not necessarily development frameworks themselves. The best way to explain is perhaps by example.
Some of the technologies that I will be working with from the start? TxF (Transactional File System), Virtualization, WMI, and RDC (Remote Differential Compression), to name a few. This week I'll be attending an internal Microsoft conference called TechReady. I'm hoping that after this week, I'll have a better understanding of the various core technologies. Not only that, I hope to be able to get a handle on what other core technologies may exist that get me excited that I haven't heard mentioned yet.
There's definitely a lot to be seen in Longhorn Server. I can say for sure that my adventure is just beginning :).
So expect to hear future posts from me on these various technologies (and possibly more as I dig into Longhorn Server more).