to work. they are just webpages that have been formated to look like a native iPhone app (black glossy top and bottom bars, gret gradient backgrounds, the correct width and height to just fill the iPhone screen etc). They look nice enough and some work pretty well (Signal is one I was even willing to pay for) but they are really no substitution for a real 3rd party app. For one you won't be able to ue any of them while in airplane mode. And there is always that annoying lag when using them over EDGE.
I for one am eagerly awaiting Google Gears type iPhone app that will give me quick access to Google Calendar (as well as mail, docs, etc) when online or offline. Sort of the best of a native app combined with the best of a web app.
Are the web apps for the iPhone & iPod touch actually web based or are they called that because they use Sarafi as an interface to run? I guess what I'm driving at is do you need internet connectivity to run these apps (once installed) or can they run locally on your device without connectivity?
Do third party apps run the same as the Apple web-apps or do they differ?