Yes, all apps work on both devices, the only exception are apps that use GPS since iPod Touch doesn't have GPS signal receiver (and older versions of both devices sometimes have trouble too).
No it Con not be used on a iPod because the iPod dose not have a GPS, the GPS is required so that field agent can conferm that you have went to your lactation and the exact location you have gone to.
with this: http://www.amazon.com/Tom-iPod-Connect-Cable-Audio/dp/B000FEKEN4 You can route your audio out from your iPod to your TomTom. Personally, I'd just use it as an iPod, I'd rather put them all on my TomTom as well as my iPod; it saves money. You can also use the TomTom Car Kit: http://www.theiphoneblog.com/2009/08/17/tomtom-car-kit-compatible-ipod-touch-gps-apps/ It's a GPS antenna that uses the TomTom GPS App for your iPod Touch/iPhone to put a map on the iPod display. You can also use other apps.
the ipod need to be On and connected to internet
You don't
No, you do not have to pay to use Safari on the iPod Touch.
no,you can use ipod,ipod touch,or iphone.you have to buy nike+ ipod sport kit if you use ipod,you just have to buy the sensor if you use ipod touch or iphone
No. You can only use the app store that is provided to you on the ipod touch.
U have to disconnect the phone service and then u can use it as an ipod touch.
No. Ipod touch is only an ipod touch, you cannot use it as mobile phone. Iphone is better
No, you don't 'need' Wi-Fi to use your iPod Touch. Your internet provider does not affect anything about your iPod Touch at any time. You can use the iPod Touch without Wi-Fi access.
No but you can download the movie/video and then sync it to your iPod Touch.