Blabbermouth points the way towards finding footage of Immortal's recent reunion gig at Norway's Inferno Festival: http://www.roadrunnerrecords.com/blabbermouth.net/news.aspx?mode=Article&newsitemID=70373
Immortal were great when I saw them way back when they toured with Manowar (a bill that worked much better than you might think), so I hope this reunion thing works out for them. I think they still have potential to carry on as the great band they once were/are.