"Quadro and GeForce Mac OS X Driver Release 334.01.01 (f01)
(See below for OS X CUDA update.)

• Graphics driver updated for Mac OS X Mavericks 10.9.3 (13D65)
• Contains performance improvements and bug fixes for a wide range of applications.
• Includes NVIDIA Driver Manager preference pane. (included previously)

This driver update is for Mac Pro 5,1 (2010), Mac Pro 4,1 (2009) & Mac Pro 3,1 (2008) only.

(The Supported models tab has this list of cards/GPUs:)
GeForce GTX 680, GeForce GTX 285, GeForce 8800 GT, Quadro K5000 for Mac, Quadro K5000, Quadro 4000 for Mac, Quadro FX 4800, Quadro FX 5600.
(The Additional Info tab has instructions on install and download link for WebDriver-334.01.01f01.pkg. Supported macs/models is not always 100% accurate. In the past some have used them on other than what is listed.)

MINIMUM SYSTEM REQUIREMENTS for Driver Release 334.01.01f01
- Model identifier should be MacPro3,1 (2008), MacPro4,1 (2009), MacPro5,1 (2010) or later
- Mac OS X v10.9.3 (13D65)"

If you installed a previous Nvidia driver, the control panel should show this update available. (And sometimes they later release a ".f02", ".f03", etc. update.)

Nvidia CUDA v6.0.46 Update for OS X:
They also released CUDA 6.0.46 for OS X:

"New Release 6.0.46
CUDA driver 6.0.46 is required for CUDA support on Mac OS X 10.9 Mavericks. Please see supported products tab.
An alternative method to download the latest CUDA driver is within Mac OS environment. Access the latest driver through System Preferences > Other > CUDA. Click 'Install CUDA Update'.

Supported Products:
Supports all NVIDIA products available on Mac HW."

The "Additional Information" tab has more installation info and direct D/L of cudadriver-6.0.46-macos.dmg. (I don't have an Nvidia card installed to verify this but there was a report that the previous CUDA installer was flagged by Gatekeeper as unsigned.)
(For later CUDA updates, see our Mac Nvidia drivers page.)
 

"The Safari 7.0.4 update is recommended for all OS X Mavericks Users and contains improvements in security."

Here's the article with Webkit security fixes in Safari 6.1.4 & Safari 7.0.4.
 

• About the security content of Safari 6.1.4 and Safari 7.0.4
• About the OS X Mavericks v10.9.3 Update (no longer online)
• About AirPrint (with list of compatible printers)
  
  
• If Lion Server has share points and privileges you want to re-create on OS X Server (Mountain Lion), make a note of them
  
  
• Xserve (Early 2009): Power consumption and thermal output (BTU) information