Second Life is a 3D virtual world launched in 2003 that currently has over 16.5 million users. Many universities, including in the US, UK, Australia, and Japan, have a presence in Second Life for distance education purposes. University College Dublin (UCD) Library entered Second Life in 2007 to engage with students and deliver classes, skills sessions, seminars, and conferences. While Second Life faces challenges around technology issues and defining its value, virtual worlds may represent future opportunities for international cooperation and reaching non-traditional students.