Apple has released OS X Server 2.1.1, which has been updated with the capability of managing DHCP from within the Server app as well as adding support for iOS 6 devices to the Profile Manager. The release also enables management of the blacklist settings for the Mail service, prevents spurious “Host name changed” alert messages after restarting, addresses an issue where AirPort base stations couldn’t be managed after updating from previous versions of OS X Server (as well as some other migration issues), and allows for setting a default NetBoot image in the Server app. ($19.99 new, free update, 136 MB, release notes)
Wake On Demand in Snow Leopard
Putting your Mac to sleep saves power, but it also disrupts using your Mac as a file server, among other purposes. Wake on Demand in Snow Leopard works in conjunction with an Apple base station to continue announcing Bonjour services that the sleeping computer offers.
While the requirements for this feature are complex, eligible users can toggle this feature in the Energy Saver preference pane. It's labeled Wake on Network Access for computers that can be roused either via Wi-Fi or Ethernet; Wake on Ethernet Network Access or Wake on AirPort Network Access for wired- or wireless-only machines, respectively. Uncheck the box to disable this feature.