mike_ppc - 2:49 pm on Jul 4, 2006 (gmt 0)
Just a note.
Remember that the CTR is obtained in G+Search network (if you have Search activated - usually it is). And the quality score is based only on Google.
So a CTR of 30% could be in fact an average of 0,4% on G and 50% in a Searchbox "partner"