HootSuite currently supports a cross-platform web app (HootSuite.com), an iPhone app, an Android app, and a Blackberry app in public beta.

HootSuite now has an iPad app! http://hootsuite.com/ipad

If you would like support for a specific mobile platform, make a request for it at http://feedback.hootsuite.com.

Mac, PC, Linux, or AIR-supported clients is not on our road map, although we do support standalone versions of HootSuite via Prism, Chrome, and Fluid: http://hootsuite.com/apps