Here's a tip for anyone involved in writing and distributing Android apps to others for testing. The usual way has been via a web server with the APK's available in a download area - then all you need to do is tell your testers to point their onboard browser to the URL. Note, if you do this it's essential you set the MIME type for .apk's (application/vnd.android.package-archive) or the browser won't launch the app installer on download. However, theres now a smarter way which has the benefit of not needing a server - use DropBox. Install it on your PC,  place the .APK in a folder, get your testers to install the Android DropBox app and share that folder. They'll get a notice when you add the apps and they'll be able to just click it to install. Very cool...