Mathematics, Pure and Applied: General Math/Stat Sites

Academic Rankings:

• A Data-Based Assessment of Research-Doctorate Programs in the United States, National Academy of Sciences
• PhDs.org, grad school rankings based on National Research Council data.
• College and University Rankings information
• US News-Best Graduate Schools, grad school rankings by subject area.

Arts and Math:

• Math Goes Pop!
• Math in the Media
• Math in the Movies
• Mathematical Fiction
• Mathematical Imagery
• Mathematical Quotation Server
• Sing about Science and Math

Blogs:

• Polymath
• Math Overflow
• Mathematics StackExchange
• Cross Validated
• TeX
• Concerns of Young Mathematicians
• Statrak
• More Math/Stat blogs, Wikis...

Calculation:

• Wolfram Alpha
• Wolfram Functions
• Wolfram Integrator
• SageMath, Open source mathematics software
• EqWorld, math equations
• Math2.org, math tables
• Number Empire. Enter a positive integer up to 10^12, press the "Go!" button, and The Number Empire states -- in yes/no format -- whether you entered a prime number, a Bell number, a Catalan number, or a factorial.
• Google Calculator
• How Many?, dictionary of units of measurement
• Online Conversion
• Online Scientific Calculator
• iFigure
• calculator.org
• Martindale's Calculators On-Line Center

Education:

• Math Education: Math Forum, NCTM Illuminations
• Washington Mathematics, K-12 in WA State
• AMSER, Applied Math and Science Education Repository
• Math Forum, Ask Dr. Math, Math FAQ
• MathNerds, mathematical guidance via an international, volunteer network of mathematicians
• Online Math Degrees

General:

• AMS Math on the Web
• Math Forum Internet Mathematics Library
• MathGuide
• Mathematical Atlas
• NSF Mathematics

Jobs and Funding:

• Careers in Math
• AMS Career Information 
• Job Hunting (2001 JOMA article)
• AMS Employment Services for Ph.D. Mathematicians
• ASA JobWeb
• SIAM Jobs
• MAA Classifieds
• EMS Jobs
• MathJobs.Org
• Chronicle Careers (Chronicle of Higher Education)
• Science Careers (Science Magazine)
• ScienceJobs.com (New Scientist)
• PhDs.org
• UW Math Dept. Job Resources
• UW Stat Dept. Employment Opportunities
• MSU-Archive of Grant Opportunities in Mathematics
• Who Hires Math Majors?

Statistics:

• Statlib

Typesetting Math:

• Math Symbols
• CTAN
• Detexify2, LaTeX symbol classifier
• LaTeX
• TUG Users Group

Librarian Resources:

• PAMnet listserv, Physics-Astronomy-Mathematics Librarians
• SLA-PAM Resources in Mathematics
• MAA Reviews
• AMS Information for Librarians
• MathSciNet Librarian Resources