Over at Living the Scientific Life, GrrlScientist has a blog post on the puffed-up importance of journal impact factors and the "rampant citation bartering among scientists" that has resulted from it. GrrlScientist contends that impact factors are by no means a good way to measure the accuracy of any individual paper, and expounds on the problems that have ensued from scientists' focusing too much on publishing in journals with high impact factors.