Also, don't forget that sometimes agencies don't want to lose you as a good temp.  If your CV is that impressive and you are good at your job why would they want you to work for someone else.?  I have first hand experience of this practice.  I once interviewed for a role but was told by the agency that I didn't get the job.  I had the feedback from the agency etc., and was told that someone else had been employed.  However, the personnel officer who had interviewed me was a friend of a friend and upon meeting her one day she complimented me on getting my new permanent position.  I didn't know what she was talking about and she proceeded to tell me that the agency had told her that I had accepted another role and was therefore not able to take up the position she was offering me.  I moved agencies pretty smartish!