For students planning to apply to grad school:
Wait, should you go to grad school? Advice (and links) from Daniel Laurison
Information on Minnesota's graduate training in Sociology

For current graduate students:
Fabio Rojas' "Grad School Rulz" (OrgTheory)
Eszter Hargittai's "Ph.Do" Advice (Inside Higher Ed)

For current graduate students & Assistant Professors:
Sociology blogs scatterplot and orgtheory
I developed this template for tracking project goals and managing time commitments that you're welcome to borrow! The template spreadsheet works better if you download instead of viewing in Google Docs. Generally, the logic is that you should have a plan to tenure (or getting your PhD and finding a job) and then work backwards from there for yearly, monthly, and daily goals. Tracking my hours religiously saved my sanity in graduate school. I also recommend creating a daily to-do list at the start of each week that breaks up your goals into manageable chunks. The template is loosely based on this 5-Year Plan template from The Professor Is In and reflects the advice on goal-setting, time management, and daily writing from the blogs listed above.

For students interested in non-academic and/or non-traditional careers:
Versatile PhD
Karen Kelsky's "The Professor Is In" Blog (see section on "Post-AC Help")