Departments

• Penn Math
• Michigan State Math

Blogeometry and Toblogogy

• Geometry and the Imagination
• Sketches of Topology
• What's New
• Supermathematics

Helpful for Undergraduates

• Tim Gowers on learning math at Cambridge
• Robert Talbert's introduction to proofs

LaTeX

• Getting Started with LaTeX
• Comprehensive LaTeX Symbols List
• WriteLaTeX

Fun Links

• XKCD
• Saturday Morning Breakfast Cereal