I want to set up a download page to download my Air app, is there a way to detect if Air is installed so you only have to download/install the app or if the person needs to install Air first?
If you use Aptana to create your AIR apps, it has a built-in badge creator, which can be accessed by opening your Application.xml file and clicking the "badge" tab normally located on the bottom of the editor (depends on your "perspective")
no problem! Badger can be a bit... wonky... when creating your badges, so you will more then likely have to create and test quite a few until you get one working exactly like you want it to.
Also, do no forget to add <allowbrowserinvocation>true</allowbrowserinvocation> to your application.xml file!! (i do it all the time :P)