I know I've ditched social sites for the time being for personal stuff, but I'll make an exception for app.net, partially out of curiosities sake.
To make that experience even better, I'm delighted to see that the authors of the wonderful Tweebot have today launched Netbot, which is basically the same thing, but for app.net. That's a good thing. It all feels nice and familiar.
It's 2 different apps for the iPad and iPhone, so that means coughing up twice if, like me, you want it on both devices, but I'd say it's money well spent.