一组可以学习，可以考虑移植到PlayBook上面的开源Adobe AIR应用(hosted by google code)

Sina微博 by SnailDesign Lab 
http://code.google.com/p/snaildesign/

ifan: 饭否
http://code.google.com/p/ifan/source/checkout

http://code.google.com/p/socialmediaplayer/

desktop QR Code Reader.
http://code.google.com/p/qrreader/

MonkeyTail 是 Adobe Air 平台的雷猴客户端。 
http://code.google.com/p/monkeytail/

LocalFileExplorer Adobe AIR
http://code.google.com/p/erkobridee/

GDocsUploader is a little utility to help you upload documents to Google Docs. 
http://code.google.com/p/gdocsuploader/

Tidypics Photo Gallery is an Elgg plug-in that provides a powerful photo gallery. 
http://code.google.com/p/tidypics/

flump is a simple application that allows your to download all of the public photos for a specific Flickr account. 
http://code.google.com/p/onairbustour/wiki/flump

Open Source Project for Merapi. Merapi allows developers to connect Adobe AIR applications, written in Adobe Flex to Java applications running on the user's local computer. 
http://code.google.com/p/merapi/

Shout-On-Air is a desktop client for a Shoutcast radio station, written on Adobe Air. Shout-On-Air can be customised to for "your" radio station, by setting the stream URI and port number in the config.xml file. The player can also be branded with your radio stations logos, colours, etc. It also shows tweets that mention the station, so listeners can send in requests, you can tweet schedules etc. 
http://code.google.com/p/shout-on-air/

airhttpd is a simple HTTP server, based on Adobe AIR 2.0 (public beta). This functionality is a part of HTTP version 1.1. 
http://code.google.com/p/airhttpd/

Backit ! v.0.85
http://code.google.com/p/backit/

JonFTP is a FTP client based on Adobe AIR technology, which is free, user friendly and Platform independent. Just like many other FTP clients, it supports communication with any FTP server, including download, upload files, manage your remote dictionaries etc…

check Tutorial and Screenshots in wiki pages 
http://code.google.com/p/jonftp/