A colleague recently posted (on an internal wiki, so unfortunately I can’t link to it) about the problem of people thinking that common agile “tools” such as whiteboards, index cards, freehand burndown graphs etc are a bit “Blue Peter,” and therefore not professional. He made a good suggestion, which was that you provide teams that are new to agile with official branded materials (story cards, pre-printed blank burndown charts and so on). They will accept these more readily, and will then embrace the underlying ideas and start using any old flipchart or whiteboard.
Here’s another argument for simplicity – admittedly from the world of TV fiction – which I’d put to people who think low-tech solutions are somehow not fit for purpose.