I been trying to compile a list of site that use Joomla. First we will start off with the no brainers. Then move on to bigger sites that have nothing to do with website:

• JoomlaMafia 1.5 (kind of a no brainer)
  
• JoomlArt (Template Club)
  
• Gavick/ (Template Club)
  
• JoomlaBambo (Template Club)
  
• Shape 5 (Template Club)
• Rocket Theme (Template Club)
  
  

Nothing To Do With Websites that use Joomla for their website:

• Angelica (Publicly-traded health services company)
• Avis (The Car rental company in Nicaragua)
• Danone (A lot more than just yogurts)
• Derbi (Motorcycle maker - part of Piaggio)
• English National Ballet (England's flagship ballet company)
• IBS Software (Software for airlines)
• Yamaha (Musical instrument company's Mexican site)
• Schneider Electric (World leader in power and control solutions)
• IT Wire (Most popular IT site in Australia)
• Jetstar (Airline owned by Quantas)
• Latvia (The country's official site)
• Mistubishi Venezuela and Poland (The car manufacturer)
• Mountain West Sports (Cable TV sports channel owned by CBS)
• Nikon Instruments (High-quality technical products)
• Olympus (Camera maker's Australian site)
• Peg Perego (Italian child accessories)
• Quizilla (Heavilly modded Joomla site owned by MTV)
• Scandinavian Airlines (Official crew guide)
• Sprint (Customer feedback site for cell-phone company)
• TNA Wrestling (Pro-wrestling organization)
• Porsche (Brazilian site)
• UNRIC (Branch of the United Nations)
• Vodafone (Cell-phone company's Icelandic site)
• Visat (Danish site for Scandanavian TV and telecommunications company)
• Kentec (Kentec Technology Inc. is one of a leading manufacturer and distributor of quality full line CCTV equipment )