“This document presents an extension that allows activities on social objects to be expressed within the Atom Syndication Format.”
Atom Activity Base Schema
“This document presents a base set of Object types and Verbs for use with Atom Activity Extensions.”
Atom Media Extensions
“This document presents an extension to the Atom Syndication Format that defines how media objects such as photos and videos might be represented in Atom and allows additional metadata to be published about linked media representations.”
Portable Contacts 1.0 Draft C
“The Portable Contacts specification is designed to make it easier for developers to give their users a secure way to access the address books and friends lists they have built up all over the web.”
Public API Status
Cool service that checks on the availability of different web services APIs.
toc.js
“toc.js will scour your page for heading tags and build a table of contents for you.”
Google API Scopes
List of the ‘scope’ options available when requesting OAuth tokens for accessing Google APIs
Google API Directory
Complete listing of Google services with APIs, linking to developer guides, client libraries and references where available.
OAuth Playground
Pretty slick tool from Google for tinkering with OAuth requests on their properties.
Mixergy
“Online Business Tips from Successful Entrepreneurs”