Windows Vista
Microsoft released Vista in January, 2007. It is meant to replace the Windows XP Operating System, which is now 6 years old. I'll breakdown the major changes, and conclude with my recommendation about whether or not to upgrade.
Security:
The internet is a dangerous place nowadays, and Microsoft has responded by adding several new security features to Vista. These include user account control, IE7's protected mode, and service handling. Although these will keep the hackers at bay for a short while, some people already claim to have found security flaws in Vista.
One security improvement, PatchGuard, has a dark side: it prevents third-party security software (like Norton and McAfee) from working properly. Unless some sort of compromise is reached, users won't have any choice but to use Microsoft's own security software, OneCare. Because Microsoft is notoriously slow to release security patches and updates, I believe that they will regret their choice to lock out the other security companies.
Convenience:
Several new features in Vista promise to make it easier to use your computer. They've simplified the start menu and integrated the search function, so that it's easier to find what you're looking for. Switching between open programs is now easier with a live, 3D preview of every open window. Finally, the graphics are very modern looking. The default color scheme includes a lot of glossy black backgrounds and rounded edges.
Should you upgrade?
If you already have a computer with XP, I recommend keeping it. Microsoft will continue to support XP until 2012. However, if you're buying a new computer, you should strongly consider Vista. Although it is tempting to save money by buying an XP computer on clearance, it is worth it for most users to step up to Vista. The only exception is the most basic users. People who only use their computer for email and occasional web browsing need not spend the extra money.