The Virtual PolyU was built in 2007. It is the first SL campus in Asia with a simulated environment for different teaching & learning tasks. Until now, eleven departments have set up various 3D learning facilities on the virtual campus and served over 4000 student avatars. For example, the Virtual Hotel enables students of tourism to deal with virtual customers; nursing students can practice medics with patients in the Virtual Hospital, and business students can hold virtual negotiations with business avatars. Herold (2010) summarizes the four key educational functions of SL: teaching, learning, assessment, designing and resources. The virtual PolyU English Department was opened in 2009. It was designed as a Tree of Knowledge with five floors: the first and second floors are lecture halls; the third and fourth are exhibition halls for student learning products. The ground floor is a Drama Lab which is currently under construction. There is also a Roof Garden for holding conferences and other activities., The tree could be developed on an even bigger scale, with different branches for different subjects or different functions; the development possibilities are endless within SL, limited really only be resources (Li et al., 2012).