•  Software
  
•  Antennas
  
•  Wireless Cards
  
•  GPS Receivers
  
•  Access Points
  
•  Documentation
  
•  Mapping & Databases
  
•  Bluetooth *New*
  

Companies:

• Actiontec
  
• Apple Airport - Add an antenna for better range.
  
• Belkin
  
• BreezeCom
  
• Cisco
  
• Compaq
  
• D-Link add an antenna jack more instructions on the Antenna jack (german)
  
• Hawking Technologies
  
• HP
  
• Intel / Xircom - Handhelds and Laptops.
• Linksys add an antenna to a WPC11
  
• Netgear
  
• Panasonic
  
• Proxim now owns what used to be, Agere,Orinoco which used to be Lucent.
• Siemens/Speedstream
  
• SMC
  
• Sony
  
• Toshiba
  
• Zoomair
  

Wanna find out what chipset a particular card is? Look at the Wireless LAN resources for Linux.