I don't have an iPhone, but from what I've seen using them at the Apple Store and viewing them in Safari, the webapps are really surprisingly good. Some of them are even phenomenal. I'm not saying real apps aren't important. I was just pleasantly surprised, because I expected the webapps to be a waste of time. After trying them, though, I think it's definitely worth finding a good launcher (I think
this one seems really nice) and storing a few key ones on your phone.