Apple today released iPhone Configuration Utility 3.1 for Mac OS X (IPCU) which lets you easily create, maintain, encrypt, and install configuration profiles, track and install provisioning profiles and authorized applications, and capture device information including console logs.
iPhone Configuration Utility 3.1 is recommended for those managing devices running iOS 4.0 or later.
Configuration profiles are XML files that contain device security policies, VPN configuration information, Wi-Fi settings, APN settings, Exchange account settings, mail settings, and certificates that permit iPhone and iPod touch to work with your enterprise systems.
iPCU version 3.1 adds support for new Mobile Device Management (MDM) features introduced in iOS 4 and enables wireless delivery of configuration profiles. It also includes support for Cisco AnyConnect and Juniper Networks SSL VPN clients, CardDAV, multiple Exchange accounts and SAN support using Simple Certificate Enrollment Protocol (SCEP).
More info and download link (9.94 MB) here.
Apple also released iPhone Configuration Utility 3.1 for WIndows. More info and download link (31.76 MB) here.