Oisin gave me this technique, so I thought I’d share with you all after doing some tweak to the script. It’s not done, and I haven’t yet found my style on the V2 CTP3 advanced function parameters, so pardon the mess.
The code:
And here’s a dialog box in action. You’ve seen these before, I’m sure. 
I was wondering when Visual Basic would find it’s way into PowerShell
add-type -a microsoft.visualbasic
Good stuff. Leveraging the .Net framework.
[...] put up a neat script (v2 required) that will copy files with the familiar GUI progress [...]