itaysk

A new update is available for your SharePoint farm!
The updates mainly applies to tow of MOSS's features: Search, and Content Deployment. (The Infrastructure Update has more to offer for other Office products, but for us SharePoint guys those I listed are the relevant ones.)

Search

Earlier this year Microsoft has released a new product called Microsoft Search Server 2008. This product was the successor of MOSS for Search and provided with an extensive search solution for the enterprise. Based on MOSS 2007, MSS 2008 featured some improvements that was promised to arrive for MOSS also, in the second half of 2008. This new infrastructure update is actually the delivering of that old promise. (More Info here: http://blogs.microsoft.co.il/blogs/itaysk/archive/2008/03/04/microsoft-search-roadmap.aspx)

The new search related features are:

• Federated Search capability - The ability to serve users with search results from different locations and search engines, from a single search query.
  
  More on that here: http://www.microsoft.com/winme/0711/31250/Federation/Default.html 
  
• Unified administration dashboard - A new improved search administration and monitoring interface.
   
  
• Bug fixes and performance improvements -  http://support.microsoft.com/kb/953750

Content Deployment

MOSS 2007 provided an out of the box tool for deploying content called  Content Deployment. From my experience with many different MOSS farms, This tool was not 100% functional in the reality test.
The infrastructure update includes bug fixed for this tool, and maybe put it back into the spotlights.
More info: http://blogs.msdn.com/ecm/archive/2008/07/15/content-deployment-and-the-infrastructure-update.aspx