Mailchimp is my favorite web service of the day, simply because their API docs include “rtfm” in the URL:

http://www.mailchimp.com/api/rtfm/

I’m the creator of Castalia for Delphi, a highly intelligent Delphi IDE add-in that adds advanced syntax highlighting, powerful code navigation, intelligent code analysis, automated code refactoring, smart coding assistance, and more to the Delphi IDE. Try Castalia today!