Here is today's announcement from RIM:
BlackBerry WebWorks also includes updates to the web application packager, new web APIs and the BlackBerry Web Plug-Ins 2.5.
Web application packager 1.5
The web application packager is used by developers to package their web applications in the same way a BlackBerry Java application is packaged, and with the same file formats. BlackBerry web applications can then be distributed via BlackBerry App World, BlackBerry Desktop Manager, OTA (over-the-air) or BlackBerry Enterprise Server.
BlackBerry Web APIs
BlackBerry WebWorks includes a set of new web extensions that enable a deeper integration with native applications and other functions of the handset.
? Send a text message from within the application ? Read call log data from the phone application, check if the phone is currently in an active call, check the number of missed calls ? Play an audio file as well as create APIs for playing, pausing, stopping and seeking of the audio file from within the application?s UI
Web Plug-Ins 2.5
Updates to the Web Plug-Ins for BlackBerry WebWorks include multiple entry points, which give developers the ability to start their application in the background, in addition to launching from the homescreen or a download folder. Applications can also continue to run in the background. Web Plug-Ins 2.5 also gives developers the ability to cache web pages and content to the handset's system memory for faster performance.