Adobe today announced the immediate availability of Adobe AIR, a new platform for building rich internet applications (RIAs) across different platforms, including Windows, Linux and Mac OS X.

Adobe AIR enables developers to create RIAs on the desktop using the skills and Web technologies — such as HTML, Ajax, PDF, Adobe Flash and Adobe Flex — they already employ. Applications deployed on Adobe AIR have the advantages of browser-based RIAs, such as speed of development, ease of use, and access from virtually anywhere. Yet they also have the benefits of desktop applications, such as the ability to read/write local files, work with other applications on a user’s computer and maintain local data storage on the desktop.

It’s an interesting variation on applications, some use desk bound applications such as Microsoft Office, whilst others use web based applications  such as Google Apps.

It’s looking like Adobe AIR will allow users to have the flexibility of web based applications with the backup of desk bound applications when there is no internet connection (such as on plane).