'Transbar', and 'Autoruns'

Transbar

Transbar is a little tweaking tool which takes advantage of Alpha Transparency in Windows 2000 and Windows XP. Using TransBar, you can adjust the transparency level of your taskbar meaning that a full screen wallpaper is made partially visible through the taskbar.

http://www.home.no/aksoftware/

Autoruns

This utility, which has the most comprehensive knowledge of auto-starting locations of any startup monitor, shows you what programs are configured to run during system bootup or login, and shows you the entries in the order Windows processes them. These programs include ones in your startup folder, Run, RunOnce, and other Registry keys. You can configure Autoruns to show other locations, including Explorer shell extensions, toolbars, browser helper objects, Winlogon notifications, auto-start services, and much more. You'll probably be surprised at how many executables are launched automatically! Autoruns works on all versions of Windows including 64-bit versions.

http://microsoft.com/technet/