Finally had a chance to play in depth with both - LOVE THEM!! Folder creation was so easy and file transfers so fast with PTG. Transferred several Word and Excel documents and very easily edited them in Docs to Go.
I'm taking a class this summer and plan on bringing the PB to take notes!
You may also consider using Box (free 50GB storage) and Google Docs (free 5 GB storage) - then combining the cloud services with Files & Folders from App World.