Like device driver, I don't know whether there are some other drivers ?
                +2 
                A: 
                
                
              What comes to mind straight away is virtual device drivers - usually emulating some kind of device, but not being a device themselves.
Probably worth a mention is class drivers that can talk to an entire class of devices (e.g. USB).
And the Wikipedia article on device drivers may be a good starting point.
                  Pekka
                   2010-05-31 23:55:58
                
              upvoted for not being a wise-ass answer :P
                  K-RAN
                   2010-05-31 23:57:51
                
                +6 
                A: 
                
                
              Taken from Windows Internals 4th (XP-based) Edition:
Hardware device drivers - Drivers using the HAL
File System Drivers - File IO for devices
File System Filter Drivers - Intercept IO and do processing on it (like AV and such)
Network Redirectors and Servers - Transmit IO on the network
Protocol Drivers - Implement network protocol like TCP/IP
Kernel Streaming Filter Drivers - Signal processing on data streams like video/audio
                  KevenK
                   2010-05-31 23:57:38