Besides Google (much more on that tomorrow, stay tuned!), there weren't a lot of "iPhone Web Apps" booths. Actually, none that I can remember. What there are a ton of at Macworld are accessories booths. Clearly the accessory market for the iPhone is ramping up quickly and may even near iPod accessory market status sometime soon.
...But it's not there yet. Case in point, I saw probably a dozen different iPod speaker docks -- all of which were "compatible" with the iPhone in flight mode only. Apple is requiring (and rightfully so, I suppose) that accessory makers submit their accessories for their seal of approval, iPhone-wise, so that the dreaded GSM-interference issue is taken care of. I personally wish Apple had managed to handle that on the device rather than forcing companies trying to interact with the Dock connector to re-make their products, but c'est la vie.
Otherwise, the thing to see, iPhone-wise, is cases. There are more skin cases here than you could shake a stick at, but there are some other gems as well. After the break, our three favorite cases at Macworld 2008.