There are cables and adapters that convert between DVI and HDMI.

No adapter needed: HDMI IS DVI, just extended.

HDMI includes audio.  Are we going to add audio out?

The HD television I use has ONE input for BOTH DVI and HDMI signals
(standard DVI terminals need an HDMI terminal adapter).  When using
DVI, a pair of RCA cables deliver audio.  We won't even use that, this
is a graphics card.  But it's not like we're blocking access to the
audio jacks.  The television makers know that DVI has no audio.

I think HDMI requires HDCP?  HDCP is optional on DVI.

Seems like I read somewhere that HDMI allowed higher limits
on something or other (resolution? color depth?) than DVI.

High resolution signal is restricted when outputting from a blu-ray or
HD-DVD decoder.  The television will take any signal you give it.

I think HDMI is digital only, so we'd need separate analog outputs.

DVI includes pins for BOTH digital and analog RGB.  So why use HDMI?
Use DVI and let the user pick the signal he wants for use with the
appropriate adapter... HDMI, VGA, component, or composite.

The main problem I see with DVI is that the connector is a bit large.
I think some cases have a problem with some cards that have 2 DVI
connectors.  Is there a standard/specification somewhere for how
large the hole for connectors is supposed to be?

Both heads do analog out, right?  So we'd need 2 HDMI plus 2 HD-15
(aka VGA) plus 1 s-video.  Somehow I don't think that is going to fit.

Assuming we want to use connectors that are standard and common,
2 DVI-I plus 1 s-video is probably the best choice, at least until
analog goes away, which is going to be awhile.

See above... you don't need S-video even, just convert take the analog
RGB from DVI and convert to Chroma + Luma with an adapter if your
television doesn't take analog RGB.
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