Here's some more info about the tarball :
jarekw@mac:~/temp/test/yt-london-hackathon-sample-code$ tree -L 1 .
.
├── LICENSE - same as in the hackathon terms doc
├── YTAlarmClock - sample YouTube Android Player API app
├── YtEndlessViews - sample YouTube Android Player API app
├── YtWatchPlaylist - sample YouTube Android Player API app
├── YtYouLern - sample YouTube Android Player API app
├── presentations - links to the Friday night kickoff presentations
├── youtube-api-v3-android-sample - an example Android app which uses the new YouTube Data API v3.0 (API docs here)
├── youtube-api-v3-codelab - Google I/O code lab about YouTube Data API v3.0
└── youtube-player-api-codelab - YouTube Android Player API codelab, includes step by step instructions for Eclipse project setup
9 directories, 1 file