Mathematical resources:

• arXiv
• Numdam
• MathSciNet
• Zentralblatt
• MathOverflow

Documentation sources:

• LaTeX
• HTML

Online encyclopedias and databases:

• Wikipedia (free online encyclopedia)
• Mathworld (Eric Weisstein's mathworld)
• IMDb (internet movie database)
• AMG (all music guide)
• CC (creative commons flexible copyright licenses for creative works)

Local:

• informal maths department home page
• maths staff home page
• university library catalogue
• Fibonacci (Bob Johnson's Fibonacci resources)
• Weather in Durham

Personal:

• a picture of me and my wife María Campaña Ramia
• María's blog