SocialDM (Direct Message) is a simple app that lets you opt-in to recieving emails from people you follow on social sites, such as FriendFeed, that don't support direct messaging.
Your Mashup not listed on ProgrammableWeb yet? Tell us about it and get listed.
Google APIlity Library
Writing a Simple Web Service with Merb
Scripting Twitter with Perl
Update Twitter and FriendFeed from the Linux Command Line
Getting Started With the FriendFeed API and PHP
Ruby Wrapper for Friendfeed API
ActionScript Library for FriendFeed API
Python, PHP, C# Libraries for Friendfeed API
APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.