Some of Microsoft's most important customers aren't happy with the battery life offered by notebooks running Windows Vista. In this article by ZDNet, they found that companies such as Hewlett-Packard and AMD were finding the problem "a little scary".
The problem only affects Windows Vista when it is using the Aero Glass interface, with it turned off the power consumption is the same or even better than that for Windows XP. It seems that those users who care about battery life are "forced to run the aesthetic equivalent of Vista Basic, the low-cost version of Vista". Even if they spent more money on their hardware to handle the Premium version.
HP have decided to come up with their own set of power management settings for Vista laptops as a solution. Microsoft doesn't seem too deterred by HP's decisions and criticism, saying that, "We actively encourage companies to customize the default power profiles so that users get the most out of their hardware".