PowershellPack is a free download with some additional Powershell cmdlets like TaskScheduler which is just what it sounds like, a cmdlet to list, create, or delete tasks which is extremely useful given all the additional functionality the task scheduler has in Windows 2008 and Windows 7.
Here is a list of the other cmdlets and the link to go download them.
http://code.msdn.microsoft.com/PowerShellPack
WPK
Create rich user interfaces quick and easily from Windows PowerShell. Think HTA, but easy. Over 600 scripts to help you build quick user interfaces
TaskScheduler
List scheduled tasks, create or delete tasks
FileSystem
Monitor files and folders, check for duplicate files, and check disk space
IsePack
Supercharge your scripting in the Integrated Scripting Environment with over 35 shortcuts
DotNet
Explore loaded types, find commands that can work with a type, and explore how you can use PowerShell, DotNet and COM together
PSImageTools
Convert, rotate, scale, and crop images and get image metadata
PSRSS
Harness the FeedStore from PowerShell
PSSystemTools
Get Operating System or Hardware Information
PSUserTools
Get the users on a system, check for elevation, and start-processaadministrator
PSCodeGen
Generates PowerShell scripts, C# code, and P/Invoke
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