Drupal

"Generic (framework) implementation of Campaign Monitor Advanced module [...] to make it work with virtually every mailing list service that provides an API to some of its functionality"

extend this module to work with other services too. Plugins for Campaign Monitor and MailChimp are already provided.

See also

MailChimp, the service, has always been awesome (used their guide to making HTML e-mail for a CiviCRM solution i did some 4 years ago). It has a dedicated module:

As teached by many excellent usability books, confirm forms are wrong, they become habitual and are just a nuisance instead of protecting you from mistakes. The computer should just do what its operator says and make it possible to revert easily.

Here here!!

"Users can login using their email address or username, depending on cofiguration, without having to leave the creation form."

"making Drupal web sites load faster. 80 to 90% of the response time (as observed by the end user) is spent on downloading the components of a web page. Therefor this is also the part where optimizations have the largest effect."

http://stevesouders.com/episodes/

"wrote a simple Drupal module — the Episodes module — that could create simple charts to compare the average page loading time per day per geographic region."