The Economist talks about the failure of 3G in Europe so far.
This is an incredible link to a diary by a lead user of FOMA, the first Japanese 3G service. One of my favorite reads of the year because of quotes like this:
'...I think i-motion is so far something like "a scrap of a pornographic book found on the street by chance"'
If you don't have to read the whole thing, at least read this entry.
Put these two together and you can see why 3G is an incremental innovation that adds little economic value to consumers - massive marketing or 'stealth' marketing.