Well, it's nice of Google that they've taken this down. But I'm really annoyed by 37signals' reply. I mean I recently developed the similar app to learn a particular framework so if I go market this product do you guys really think I should be taking this down if I see DHH or JF complaining how I ripped their app off? I mean a 100% similar app will cetainly be a dissaopinting effort (for both them and I) but I can always improve on that(improved/diff UI, new features and etc). Moreover, I can point anyone to couple of BaseCamp and Campfire clones and HuddleChat was just an example for app_engine (not a stupidly easy thing to implement like Basecamp and not a technicaly very challenging project). Just the right balance for a good tutorial. I was looking forward to read how did they do it using app_engine ;(