-The internet browsing thing is basically because a lot of Japanese websites have a "mobile mode", ultra simplistic layout as an option. It's not really a phone feature.
-TV receivers in mobile phones require a special signal to be sent for them (the currently available models can't deal with normal dvb-t, for example [AFAIK]), and there are different standards in use for this in different parts of the world. And well, it just isn't a terribly useful feature in the first place.
-Push email is used to replace SMS, which is pretty cool but that'd require a data plan over here.
On the other hand, Japanese phones generally lack stuff we take for granted: t-9 text input, spelling dictionaries, they use a slightly different network standard (FOMA vs 'normal' 3G),... all of which are possible to fix, of course, but then, it wouldn't be that hard for the competitors to copy their good features either.
I'd say that if Japanese phones ever become a hit in the west, it's because of the cool and different designs rather than features.