Heard of Laszlo?

Well I hadn't until today when I was doing some Google searching for help with a CFC problem. Laszlo is like Macromedia Flex in that it allows you to create Rich Internet Applications using XML and JavaScript (at least that's what it looks like so far). It then compiles this and outputs a SWF file which plays in your browsers Flash Player. There is a version that is open source that I'm going to download a play with a little to see how it works. If anyone has used it or tried it, what do you think? I'm using one of their demos on this page to provide the weather (defaulted to my current zip code, 48813, but you can put your own in).