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A given soundcard can only output through one source, so all sounds for that card go out whatever is plugged in (your speakers or your headset).
If you have multiple soundcards (including the "soundcard" that's detected with a USB headset) you can tell TeamSpeak which output device to use. At that point TeamSpeak will direct sounds out that card's output - while Windows continues to push system (and game) sounds out the "Default" windows card.
I thought it might be nice to have teamspeak go through a headset while game sounds go though speakers. That way, voices can be heard over game sounds, teamspeak volume can be adjusted w/o alt-tab, and others won't get that feedback when I hold the talk key the same time as someone else.