I completely missed this but it looks like OpenLaszlo 4.1 has been released and it includes full support for DHTML/Ajax as well as SWF/Flash. In addition there are a number of bug fixes and overhauled documentation.
Back when OpenLaszlo started showing being able to create either DHML/Ajax or Flash content with the same codebase it got a lot of people talking about bridging the gap between Ajax and Flash. I'm not quite sure it does that, but it does provide developers with a more nimble way to deploy applications. You can now write OpenLaszlo and then choose which platform to compile to. And you can change it up as you go if you need to take advantages of one platform or the other. I was also always a fan of OpenLaszlo UIs and so having those effects available in DHTML/Ajax makes this a pretty compelling way to create those applications.
In addition to DHTML support they've also added early support for SWF 9 features in this release. If you're interested in participating you can head over to the Wiki, the JIRA bug tracking system, or the mailing lists and forums.