By: IT News BlogGoogle plans to add a presentation software (yes, just like Microsoft's PowerPoint) to its Google Docs Web-based tool for word processing, e-mail and spreadsheet. Harry McCracken says this should cause Bill Gates and Steve Ballmer to be “profoundly troubled.”After all, despite the fact that the Google office suite are in their early stages, the tools are free. Dave Rosenberg is worried about a Google lock-in.