This is what I do, but with the mini-DVI to DVI, then a DVI-HDMI cable. For audio I use aux to a set of ipod speakers lol. Good enough for me! I could get a longer AUX cable though I guess to hook to the HDTV.
my father got a VGA adapter, and an input to output audio jack.
if the monitor or lcd or whatever it is doesn't have sound input, then you should plug it into speakers, or you could just leave the speakers on the computer itself.