From a glance, it looks like it has the better features from either of HyperCard: message passing between "objects" vs. the class hierarchy, and VisualBasic: timers vs. the idle message, floating properties box vs. the dialog box.

<snark>It would be good if it has an option/property for resizeable windows "stacks" with some of the auto-resizing, alignment, and guides like Xcode - maybe it does, I get an error every time I attempt to login to LiveCode. "Critical mass" in user communities would be the killer feature, too bad the LiveCode App doesn't come by default with every new iPhone.</snark>