Questions arise as to the choice of avatar names, appearance, and whether to use multiple avatars for different purposes across the many virtual worlds that are appearing. Some of these are restruicted by the virtual world platform in use , or by policies in operation in your own organization.  General Internet use guidelines are generally the ones to follow.  You shoud treat virtual worlds as just another Internet technlogy, and it is likely you will be using it in the future as widely as you use the 2D browser today for many purposes.

IBM have produced a useful set of guidelines for ther own employees which you may find helpful (archive as at 1-Sep-2009 attached):

http://domino.research.ibm.com/comm/research_projects.nsf/pages/virtualworlds.IBMVirtualWorldGuidelines.html