Here is a script I wrote to rename a bunch of pictures I had on my computer. It lets me put a prefix on the front, so that I can tell what it is by the title in the taskbar at the bottom of the computer when the picture previewer is minimized. This script could easily be tweaked for many other mass renaming jobs without much programming knowledge. Enjoy!
=========(Begin File...just name it something.ps1)========================
Write-Host "Tell me a prefix to put on the front of all *.jpg files in this folder:"
$Prefix = (Get-Host).UI.ReadLine()
if($Prefix.Length -gt 0)
$Files = Get-ChildItem *.jpg
foreach($File in $Files)
$NewName = $Prefix + $File.Name
Write-Host "Renaming $File to $NewName"
Rename-Item $File $NewName
Write-Host "No prefix. Doing nothing."
Write-Host "Press any key..."