Looks interesting but not much more. I mean whenever you do a web with some editor, specially an online one, you don't have full control and I don't think this will succeed if you can do only webs entirely based in flash, that may look cool at first but then boring. Anyway if it becomes a good business undoubtedly that yahoo or google will buy it, so maybe if you wait some months you can say that Sitecube is really owned by one of those.

I have never heard of this website but I will take a look and suggest my opinion