Idera PowerShell Plus is a top grade script editor.  In addition to full PowerShell support, it syntax highlights VBS, .CMD/.BAT, XML, HTML and SQL scripts.  Up until now it has been a commercial product, but the company has just made it into a free product.

PowerShell support is full fledged with debugger support, code signing and the ability to retrieve and publish scripts from large web sample repositories.  It also has a system explorer that generates code for many activities such as inventorying and modifying system services, printers, applications, etc.

Here is where you can get more information and download: http://www.idera.com/Free-Tools/PowerShell-Plus/

They also have a lot of samples scripts for Active Direction, SQL, Exchange and Sharepoint here: http://www.idera.com/Free-Tools/PowerShell-scripts/