1)   Task Commander 2.5
Use this unique application launchermanagementmaintenance solution to free up valuable desktop, taskbar and Quick Launch panel space. Get an advanced Alt-Tab switcher replacement. Run your favorite applications with just a click! Try it for FREE!
visual task switcher, task switcher, window switcher, task manager, app launcher, application launcher, processor usage, cpu usage,

 2)   WinGlance 1.2.8
WinGlance is a visualizable ALT-TAB replacement task switching utility. It lets XP users switch from one open window to another, with only a click at the full-screen neatly-arranged window-snapshot list activated by Alt-Tab or mouse gesture.
Alt-Tab Replacement, Task Switching, Task Switcher, Utilities, Desktop Management, Desktop Enhancement,

 3)   AltSwitch 1.1
AltSwitch is an advanced replacement for the standard Windows Alt-Tab task switcher. AltSwitch lets easily navigate between tasks running on your computer. For each task small preview image is displayed. Skins are supported.
alt tab replacement, task switcher, switcher, windows manager, replacement, shell enhancement, enhancement, desktop enhancement, task preview, task,

 4)   CubeDesktop 1.2
CubeDesktop creates six virtual and independent desktops, increasing the space you have to work and play. Use our stunning 3D technology to quickly show, switch and move windows between desktops.
3d, virtual desktop, task switcher, windows vista,