I went along to this tonight. It was the opening night, show runs from tomorrow (June 16th) through until July 16th 2005 on Poland Street in Soho and is well worth a look.
Jim Marshall was there chatting to the visitors which was nice. He took the covers to the Johnny Cash prison LP's 'Folsom' and 'San Quentin', I chatted to him a little while says he prefered 'Folsom' as that was rawer and if he'd asked the prisoners to leave with him after the show they would have all got up and leave and left with him, the guards wouldn't have been able to stop them.
Some great pictures, the Johnny Cash one is quite famous but some of the others are not often seen which is quite nice. Free to attend, open to the general public.