Some may be already aware of this guy - I just came across him yesterday, looks like he does some really nice work - Canadian too ! (Vancouver Island IIRC)
Link to a random video of his: Tig Welding Aluminum TRICKS?! How I Get SHINY TIG WELDS! - YouTube
Link to a random video of his: Tig Welding Aluminum TRICKS?! How I Get SHINY TIG WELDS! - YouTube