After a nice day knowing new people and mainly learning, this is my contribution to the community in this first Drupal Sprint in London:

• http://drupal.org/node/1899230#comment-6987148
• http://drupal.org/node/1886184#comment-6987222
• http://drupal.org/node/1885736#comment-6987374
• http://drupal.org/node/1837270#comment-6987422
• http://drupal.org/node/1721378#comment-6987532

Doesn't seems too much, mainly because i've learned more than what i've really being able to give.

Documentation and tools which I've found useful:

• The most one, Coder. It will give you some hints on where to start: http://drupal.org/project/coder
• You can use also paraview, an online tool which will give you more tips about the code you are reviewing: http://ventral.org/pareview
• And, if you prefer to install it: http://drupal.org/project/pareviewsh
• Doxygen and formatting conventions: http://drupal.org/node/1354
• And, of course, the Drupal Coding standards: http://drupal.org/coding-standards

• dreditor is a nice, interesting usefull plugin for your browser: http://drupal.org/project/dreditor
• php code sniffer: http://drupal.org/node/1419988