Idera PowerShell Plus is a free helper app for PowerShell users that provides an IDE for building PowerShell scripts, a library of pre-loaded scripts, and tutorials, among other features.
Petri IT Knowledgebase has published a review of the software, complete with many screenshots. Reviewer Jeff Hicks says, "I think for someone just getting started with PowerShell [who] is a little unsure about how to use it, PowerShell Plus is a good introduction." For anyone familiar with the PowerShell prompt, however, it may not be as useful.
If you've used PowerShell Plus, please share your assessment of it.