Nintendo have announced
a microphone/headphone headset for their DS handheld game console, intended for use with games allowing voice communication between players. Though perhaps that's only the start; were Nintendo to bring out a VoIP package for the DS, it would turn the WiFi-enabled pocket game console into a reasonably useful internet phone. Given that
a version of the Opera web browser is about to come out for the Nintendo DS, it's not entirely implausible to imagine Nintendo doing a similar tie-up with Skype (or perhaps Google Talk), or else bundling a standard SIP client with their handheld.