guldener.net

Did I mention that drupal is great??

Needed to provide webservices to a drupal page. Look at this hillaryous module:

http://drupal.org/project/services

Some helpful sites to help implementing the services:

General overview: http://drupal.org/node/783254
Tutorials and examples: http://drupal.org/node/113697
Nice php-class with example: http://drupal.org/node/1070066
Creating a node: http://drupal.org/node/1354202

Other helpful links:
http://www.barnettech.com/content/drupal-7-create-user-using-rest-and-curl

Logging and analysing email traffic from your website.
Sounds promising:

http://www.mailjet.com/