Discovered this last night on the App Store, and tested it on my Mac. Works brilliantly.
Download the Teamviewer App on your iPhone, and the corrosponding software on your PC or Mac.
Configure the Teamviewer program and match the settings on the Teamviewer App. As long as the App is connected by wi-fi or 3G, you can remote access your PC or Mac!
If you combine it with Dropbox, you can get docs from your machine directly to your iPhone with the Dropbox app!