There is no point in reviewing what I saw at Theatre in the Pound because it changes every day. It's an opportunity for companies or individuals to try out new ideas in fronty of an audience and get feedback. Everyone is charged £1, audiences and performers (the latter pay £1 per actor, with a maximum of £10). Each performer/group has a ten minute slot (more if there aren't enough to fill the hour).
It originally pioneered at the Cockpit Theatre in London and it's a fascinating idea. I was there early in the festival so they only had two performances, a large group and a solo piece, which were very different and the juxtaposition of the two pieces alone was enough to give a real picture of the diversity of theatre available in Edinburgh.
Each day is different, so you really are taking a chance when you go, but at 11.30 in the morning and at only a pound a ticket, you'd be daft to miss it!