Bill Vick caught me on a great day (well a bad hair day but still I was in a great mood) and asked me a bunch of questions about sourcing, the "big" one being "With the many tools available for identifying and recruiting passive candidates, how do you measure your return on invested time and effectiveness for your favorite web tools?" Check out my answer (and what others have to say on the subject): 

Shally Steckerl - Talent Acquisition Consultant and Search Guru
by: vPIP
Embed (copy & paste):
 
vPIP_setVisible("divEmbedCode47", false);