There are fewer devices nowadays which sport the long-trusted IrDA port. Some have decided to drop the feature in favor of Bluetooth. HTC, the leading OEM for Windows Mobile powered devices, has recently announced that they will be dropping the IrDA port for the next wave devices.
Infrared is still the quickest and most reliable means of beaming business cards or files between mobile phones and PDAs. Bluetooth, although more advanced, is still clumsy and too time consuming. 
