Do What You Are
There are lots of these online, but I thought this Personality Type Quiz was simple and smart, letting you find your Myers-Briggs type with four quick choices and then exploring the implications of your type. I'm solid INTP, meaning that I tend to be (quite accurately):
"quiet, independent, and private; logical and unemotional; creative, ingenious, and innovative, global thinkers; curious and driven to increase their competence; casual, and adaptive; nonconforming and unpredictable."My list of suggested careers and the advice on how to love me seem pretty close, overall.
A lot of people make fun of these quizzes, but I think they're good tools to get you reflecting about who you are and to trigger ideas for how to align various parts of your life (work, especially) with your identity. Bridges Transitions (my current employer) also offers a subscription-based version for schools that has a similar flow, but with more in-depth questions, richer reports and professional resources.
Thanks to Penelope for reminding me to dig around in this stuff some more.