Mac Box Set
The Mac Box Set is a package offering that bundles the following Apple software:

• Mac OS X v10.5.6 Leopard operating system
• iLife '09, featuring the new iPhoto '09, iMovie '09, GarageBand '09, iWeb '09, and iDVD
• iWork '09, Apple's productivity suite for home and office including Pages '09, Numbers '09, and Keynote '09

Apple is offering the Mac Box Set for $169 (US), customers can purchase it immediately from Apple.  If purchased separately the prices of the software are $129 for Mac OS X, and $79 each for iLife '09 and iWork '09.  Therefore, the retail price of the Mac Box Set offers buyers a $118 saving via the bundle, or in other words, a 41 percent savings versus buying the titles separately.

Amazon offers $20 discount
If buyers are willing to wait for Amazon to announce availability, a $20 Pre-order discount brings the Mac Box Set down to $149, a 12 percent discount off the $169 retail price.  At $149, buyers save 48 percent off via the bundle versus purchasing the software separately.  Furthermore, the $149 price is cheaper than purchasing iLife '09 and iWork '09 at their respective $79 retail price.  Thus, it's a no-brainer to buy the Mac Box Set as you save $9 and get a copy of Mac OS X.  The only downside is that you'll have to wait until Amazon announces availability.

Update: Amazon now shows that the Mac Box Set is "In Stock".

Mac Box Set System Requirements

• Mac computer with an Intel, PowerPC G5, or PowerPC G4 (867MHz or faster) processor
• 512MB of RAM; 1GB recommended
• High-definition video requires at least 1GB of RAM.
• Approximately 14GB of available disk space
• DVD drive required for installation
• QuickTime 7.5.5 or later (included)
• iMovie requires an Intel-based Mac, Power Mac G5 (dual 2.0GHz or faster), or iMac G5 (1.9GHz or faster)
• Burning DVDs requires an Apple SuperDrive or compatible third-party DVD burner.
• GarageBand Learn to Play requires an Intel-based Mac with a dual-core processor or better
• iChat requires a compatible camera. Video chatting requires a broadband Internet connection
• AVCHD video requires a Mac with an Intel Core Duo processor or better.
• 24-bit recording in GarageBand requires a Mac OS X-compatible audio interface with support for 24-bit audio.
• Some features require Internet access and/or MobileMe
• iPhoto print products are available in the U.S., Canada, Japan, and select countries in Europe and Asia Pacific.
• Flickr service is available only in select countries.