These are my links for 25 dic 2009 through 27 dic 2009:

• Sys-Admin.net – Welcome to sys-admin.net – This website is designed to be a repository of tips, documentation, and tutorials
  concerning the administration of machines running various flavors of UNIX.

  You may wish to conduct additional research on Google, Yahoo, forums, USENET, mailing
  lists, or other resources before implementing any of the information on this site in
  a production environment. We cannot guarantee that all information is accurate and
  will not adversely affect your systems!

• [All iPhone & iTouch Firmwares] System Restore Image (download here) – Hackint0sh – via pecus
• Cheat Sheets per tutti i gusti | Lo Skyblog – Un'altra lista lunghissima di cheatsheet