Tyler Deitz
i think you will appreciate the ios webapp sun (pattern.dk/sun). it forces the user to add the webapp to their homescreen before revealing features. this makes it much easier to control the UX of the application. i don't know if this is something you'd want to implement for sublevel but it's pretty neat!
Paul Woolcock
I actually love that app, but that "feature" disqualifies it as a "frictionless product." Certainly, adding it to the home screen should be encouraged, but forcing the user through a series of steps just to use the product is, by definition, "friction"