While the G35 does support driverless operation, Logitech have included a basic software package which enables you to adjust treble and bass volumes and configure the buttons. Although you can’t create your own functions for the buttons, there is a comprehensive selection of predefined functions for these buttons ranging from iTunes media controls to Ventrilo "Push to Talk".
For the microphone, Logitech have included a "Voice Morpher". This changes your voice to sound like a variety of different creatures. This works surprisingly well even though its usefulness is somewhat limited (unless you play WOW!).