Despite the fact that most of you prefer XP to Vista and would rather Microsoft extended XP's shelf-life, several new and improved features available in Vista would be great to have in XP.

A Better Explorer:

Xplorer2 (original post)

QT TabBar (original post)

Explorer Breadcrumbs (original post)

TrueCrypt (original post)

Take Quick and Easy Screenshots:

Screenshot Captor (original post)

Clip2Net (original post)

Jing (original post)

Task-Switching à la Flip 3D:

Shock Aero 3D (original post)

Integrated Start Menu Search and Launch:

Start Menu

Launchy

Replace the Windows Sidebar:

SideSlide

Live Thumbnail Previews of Files:

Xentient Thumbnails

Streamline Your File Renaming:

Better Rename

Visual Tooltip

Give XP that Vista Look

Uxtheme Patcher

Windows ReadyBoost

eBoostr