Should you go to grad school? Advice from renowned network scientist Duncan Watts.
The PhD Grind: An 122-page memoir of Philip Guo's PhD career in computer science.
The Professor Is In: An excellent resource by Karen Kelsky, ex-tenured prof and now professional academic career coach. I highly recommend her Pearl of Wisdom blog.
Sterne's collection of academic professionalization resources
Ph.Do: Eszter Hargittai's excellent advice column on professionalism
Get a life, PhD: A sociology professor's advice on writing, being effective and efficient at work, and other professionalization advice.
Academia vs. Industry: Lada Adamic's excellent summary of the pros/cons of both worlds
Specific advice for communication grad students: Jesse Fox has compiled a list of key books for comm students
Quick R website (intended especially for experienced users of other statistical software).
Machine learning resources
LaTeX and others