I have the Iphone 3G-16Gb too:
Is simple AMAZING!
really simple and fast to open any web pages, with the touch display you can zoom pages really easy, just look at the picture.
3G network in Italy is really good and fast, BUT what is interesting is when you walk in the City.
When you will connect in Internet, the Iphone first try to find one available WIFI point, normally when you are close to some builds, the Iphone can find a lot of WIFI access point and always some are OPEN!
Install the Free Nimbuzz and you can chat online with the all messenger and also make really good FREE calls with the Skype contacts.
Download from Applestore the Mobile Studio application and the Iphone is able to open the all type of documents: PDF, Doc, powerpoint...and shre it by WIFI, like a normally USB Pen stick.
I try also the Blackbarry touch too, slow like crazy and not able for this all features.
I use only Linux, but with Apple..think different!