In SharePoint development, you are always in need of generating a unique id (aka GUID) for your features and solutions.  While most developers have a GUID generator setup in Visual Studio, here is a quick alternative if you don't want to open Visual Studio but have Powershell open.

[System.Guid]::NewGuid().ToString()

 And volia...you have a new GUID that you can use in your application.

Eli