Dual-Sound and an Additional Monitor

Hey everyone. I came here awhile ago when I was building my computer, and I return once again to tackle an issue about sound and possibly sound cards.

There's a lot of little projects and media/sound-related issues I've been wanting to tackle, and here's a question I've had for awhile, and I'd like to move forward with solving it. I see and read so many different things, that I want to ask my question directly and see what sort of answer you ladies and gents have for me.

- I have an EVGA 780i MB with onboard sound, and an EVGA 8800GT gpu with two DVI connections, one that leads to my 19" LCD and the other to my 22" HDTV. So, how do I get sound to my HDTV (with converter-box)?

From what I understand, DVI only transfers video, though I've heard some say a DVI to HDMI will do audio, but I'm unsure rather this rumor is true. Regardless, I only have component connections (link to my setup) http://downloadcenter.samsung.com/content/EM/200608/200... .

I know I can run sound from my onboard audio to my TV, but I want to go one-step further. I would like to be able to listen to music/use the sound on my computer while also watching a movie on my TV from the DVD player on my computer. Seems such division isn't possible with basic onboard audio, but how would I go about achieving this? I've always gathered the impression that with a sound card, your computer could push sound from one application to one destination (speakers) and the audio from another application (DVD player application) to another desitnation (TV). Is this possible, or only a poor man's inane dreams?