Computerworld posted a review on Windows Vista Build 5472. Here's a bit:

In this interim build, Microsoft has changed how UAC manifests itself. When a background application or service trips UAC, instead of interrupting what you're doing in the foreground, it flashes oranges in the taskbar. You can complete what you're working on and then click the flashing orange program button to answer the UAC prompt.

The good news in Build 5472 and beyond is that a long list of previously annoying - in some cases unnecessary - UAC prompts have been banished. One way Microsoft is going about that is by localizing UAC protection to the areas that are most dangerous. For example, opening the Windows Firewall Control Panel no longer requires you to click OK to a UAC prompt. But attempting to turn off the firewall or change its settings does spawn a UAC prompt.

In some cases, Microsoft has smartly reconsidered the existence of UAC prompts. There's no longer any UAC prompt surrounding the use of Windows Defender, the Setup Fax Wizard or the Scanners and Cameras Control Panel

One of the most mystifying UAC behaviors in Vista Beta 2 caused a prompt to appear when you tried to delete some desktop program shortcuts. If the program was installed for use by all accounts in Vista, then UAC blocked the deletion of the icon in Beta 2 with a permission prompt. If the program was only installed for the current account, then deletion of the same program shortcut would occur normally. Since there's no way for Windows users to know which way the program was installed, even experienced beta testers were confused. For Build 5472, so long as the running account has administrator privileges, then icons installed "on the public desktop" will be deleted without issue when you drop them into the Recycle Bin.