This is something I wanted to see for a long time – a commercial application shipping with PowerShell support and a PowerGUI pack on top of it!
Quest File Migrator for SharePoint seems to be one of the first products that did that. The product is basically a solution to migrate your existing file servers to SharePoint (WSS or MOSS) sites. As your migration project grows in scale you might want to get a solution to bulk-manage your migration agents and jobs.
Ayman’s SharePoint File Migration PowerPack allows you to do that: deploy, remove, manage migration agents; start, stop, create, remove, schedule migration jobs, and so on. All that obviously uses PowerGUI sorting, filtering and reporting capabilities and shows you the PowerShell code behind.
Full disclosure: this is obviously a product by Quest Software – the company for which I work and in which I am doing my best to PowerShell- and PowerGUI-enable all products. However, PowerGUI and PowerGUI.org are open to any other software company in the world, and you can freely use it to make your product better. Anyone can post any PowerPack to the PowerGUI library.