Gmail Creator Says Chrome OS Is As Good As Dead
I would actually question the effectiveness of using XML or JSON over HTTP as an RPC mechanism. In my experience I get much better performance rolling my own protocol with sockets.
Performance isn't everything. The protocol performance is usually dwarfed by application performance. Using standard data formats over HTTP has some huge advantages: all the pre-existing tools work. For example, you can test your services from the command line using curl, and use other existing tools to parse the data. Debugging a custom protocol and data format over raw sockets is much more difficult. You also get all the existing servers, load balancers, caches, clients, security tools, etc.
Ext4 Advances As Interim Step To Btrfs
The catch is that coming up with such a layer is kind of tricky. That's probably why Sun didn't bother
Actually, they did. ZFS has the SPA and DMU layers that sit above the ZPL.