Have you been waiting (like me) for esXpress to release their latest backup solution that will support ESXi?  

Well, it looks like a few scripts have popped up on the VMware forums that provide this much needed functionality.

Below are the links,  I have yet to test any of these.

http://communities.vmware.com/servlet/JiveServlet/download/1029047-12752/Using%20Windows%20Services%20for%20Unix%20NFS%20Sever%20to%20backup%20VMWare%20ESXi%20Virtual%20Machines.pdf;jsessionid=3379BD018D6594130EEF254B994D8A41http://communities.vmware.com/docs/DOC-8760