As you can read in previous post regardning this issue:
http://forums.pelicanparts.com/showthread.php?threadid=295942
...my opinion is that ITB's are not needed on turbocharged engines as eventual advantages of faster throttle responce are miniscule compared to turbo lag. With other words, if you win couple of ms on throttle responce, it won't be felt as it takes turbo 300ms to spool up anyway.
Added costs and complexity just isn't worth it.
But I would still like to point that shape of plenum and runner length is indeed important, even on a turbocharged engine. Engine will still breathe in "gulps" and careful tuning of intake pipes can help you extract more power or (even better) help turbo wake up lower down.
To me, optimal turbo setup are twin turbos with twin plenums and throttle bodies + balancing pipe.