I have an Intel DG965OTMKR main board with integrated SigmaTel HD Audio. None of the stream capture programs I tried found any output on Sound Mapper, etc. The same was true when I tried Tunebite Premium. In fact, Tunebite has an autodetect feature which indicated the SigmaTel driver did not support stream capture and that the only way to capture streams with this audio solution is to connect Line Out to Line In.
Obviously, that also works for all other devices and programs with this problem. However, that is not an all digital solution.
I did contact SigmaTel who indicated that Intel did request the stream capture feature to be included in a future release of the SigmaTel HD Audio driver. (Intel distributes the driver from their support site, but they did not write it and they do not maintain it.) SigmaTel will not distribute the driver; they only provide it to Intel. SigmaTel indicated the timeframe for release of this feature should be about Nov-2007. Of course, Intel will only post the driver after qualifying it, so it might be a few weeks later before it appears.