Microsoft have released a number of cheat sheets, offering useful shortcuts and info for PowerShell 4.0, as well as a few of its related technologies such as DSC, WMI, and WinRM.

You can download these in PDF format from http://www.microsoft.com/en-us/download/details.aspx?id=42554 and then print them out and stick them up next to your desk to impress people who walk by.