A wide range of car mounting kits are available - many of them with PDA holders tailored to specific models such as the Treo. They range from simple holders that just keep your Treo safe to sophisticated devices with built in power supply, GPS receiver to support Treo sat-nav software, speaker and microphone for hands-free telephone calls

• Arkon - US manufacturer but available in Europe
  
• Brodit - Swedish manufacturer, not known to be available outside Europe
  
• Carcomm - Dutch manufacturer, not known to be available outside Europe
  
• Seidio - US manufacturer, available in Europe but some of their Bluetooth implementations only work with phones from US networks using CDMA.