"About (Late 2013) Mac Pro SMC Firmware Update 2.0 (544KB)
Recommended for all Mac Pro (Late 2013) models.
This update enables Mac Pro to enter Power Nap without running the fan for most Power Nap activities, and addresses a rare issue where a low-speed USB device may not be detected at boot."

Per the updated page of Intel-Based Mac Firmware Updates (below), this is 2.20f18.
(BTW: One Mac Pro owner said his (new alum.) USB keyboard was not recognized after the update (an older USB keyboard was), but zapping the PRAM helped. (Sometimes just disconnecting & reconnecting devices after an update helps so I wonder if just swapping the alum keyboard back would have also worked.) Another old tip for problems after an update (like high fan speeds or other power related issues) is to reset the SMC.)
  

"About iTunes 11.1.5 (232.7 MB)
This update fixes a problem that may cause iTunes to quit unexpectedly when a device is connected and improves compatibility with iBooks for Mac on OS X Mavericks.

System Requirements: Mac OS X version 10.6.8 or later"

The Xcode Update for OS X Server (Mavericks) addresses an issue that could interrupt bot integration on headless servers running OS X Mavericks v10.9.2.

The Xcode Update for OS X Server (Mavericks) is available both as an automatic software update from the Mac App Store, and as a manual download from the Apple Support website. (not there yet as of post time)
If you are using the Xcode service in OS X Server (Mavericks), install the following updates on the server:

• The OS X Mavericks v10.9.2 update
• The Xcode Update for OS X Server
• The Server v3.0.3 update

(Added a note about the upgrade order to yesterday's post on OS X server v3.0.3.)
  

• EFI and SMC firmware updates for Intel-based Macs
  (added Late 2013 Mac Pro SMC Firmware Update 2.0, above)
• Mac Pro (Late 2013): Using multiple displays
• OS X Server: How to prevent sleep (archived)
  
  
• Safari: About Internet plug-in management
  (above now titled "How to install Safari extensions on your Mac")
• About the new iWork for Mac: Features and compatibility (archived)
  
  
• If you can't redeem your iTunes Gift Card or code
• If you're asked for the password to your previous ID when signing out of iCloud
  
  (the following doc now archived/no longer updated)
• OS X 10.5, iMac (Mid 2007): Stuck in a "loop" at the login window after upgrading to Leopard

• Freeware VM VirtualBox 4.3.8 (See the Change Log for details)
• Review of 2013 Mac Pro 6-core ($3999) (MW)
• CalDigit T3 (Thunderbolt) Review (storagereview)
• OWC Adds Independent Mode to Elite Pro Qx2 (sponsor blog)
• Want Safety Using the Internet? Stash the Browser Somewhere Else
• GM expands Ignition Switch Recall, cites 13 deaths