Gnip has completed the latest version of their schema and is now about to embark on a campaign to integrate at least 100 services by mid year. They’ve decided that rather than simply choosing them by themselves, they’d crowd source the process.
There are currently over 350 web services in consideration with more being added every day. You can vote on which ones you’d like to see integrated by going to https://gnip.uservoice.com. This will be a dynamic process with Gnip tagging the web services that are either in process or completed.
If you build web apps for a living, consume data, or just like to vote on things, come help Gnip prioritize the next services to integrate.