This nice LCD2USB device is an open source and open hardware project. The mani idea was to make cheap solution of LCD connection to various PC’s via USB port. The total cost of LCD2USB is up to 10 Euros, while applications can be run under various operation systems like Windows, Linux, MacOS. This may be a nice addition to your PC to display various system information or simply for showing MP3 song titles.
Information which is sent to LCD can be configured and transferred with various well known applications like lcd4linux, LCD Smartie (requires a seperate driver), and LCDProc.
USB interface is software implementation on AVR Atmega8 microcontroller, so no expensive special micros are needed. Project is very well documented and constantly updated.
Interface HD44780 LCD to USB port - [Link]