Twiddling your thumbs in anticipation now that you've placed your PlayBook preorder? Why not put yourself to good use by teaching that dusty cranium how to use it? At first glance, this guide for retail salespeople looks like it could have been thrown together by us, complete with a tour of the ports and a helpful reminder that you can use the touchscreen in both landscape and portrait mode. But it's in the sales simulation section that things really start to get interesting. For all the talk about how the PlayBook i
