Sorted:

Android AudioTrack class for playing piano sounds-Collection of common programming errors

Facebook API: get random friend with PHP-Collection of common programming errors

Retrieving messages from status table in FQL using PHP SDK-Collection of common programming errors

Get file from javascript-Collection of common programming errors

PHP: Detecting fopen() failures when downloading images-Collection of common programming errors

Error OAuthException: (#200) when inviting to Event-Collection of common programming errors

Exceptions in php sdk facebook using FQL (error 100)-Collection of common programming errors

Twitter API (From ID to Screen Name)-Collection of common programming errors

Camcorder activity not working with example code-Collection of common programming errors

Displaying .jpg in an ImageView from the web-Collection of common programming errors