Windows 7, SP1 includes only minor updates, among which are previous updates that are already delivered through Windows Update. SP1 for Windows 7 will, however, deliver an updated Remote Desktop client that takes advantage of RemoteFX introduced in the server-side with SP1 for Windows Server 2008 R2.
Windows 7 is ready for commercial deployments now and many industry experts have recommended that customers do not wait for SP1. Many organizations are already in the process of deploying and are receiving benefits from their Windows 7 deployment. You can read some of those customer stories, as well as Forrester’s view of the benefits of Windows 7 on Windows Blog