From the site: As long as you adhere to the requirements of the XMPP specs, you should be able to connect to the Google Talk service. Other clients that can connect include [[http://gaim.sourceforge.net/ GAIM]] and [[http://www.ceruleanstudios.com/learn/ Trillian Pro]].
There are a number of ways to discuss API popularity. Our metrics are based on developer engagement. The "track" functionality on ProgrammableWeb lets developers declare an interest in receiving updates on particular APIs. Which APIs and categories are seeing the most activity.
ProgrammableWeb now tracks over 100 Google APIs. The search giant has always been developer-focused. By mid-2006, way early in the API timeline, Google already had 10 APIs. We'll look at where they are now and reflect on how amazing it is that eight of those 10 are still around. And there's an irony to the two that are no longer available.