I've used several different S/PDIF coax/RCA/7-pin digital cables. For now, I use a Radio Shack (!) cable that is sturdy and so far bulletproof. Go figure!
Digiflex Gold 75ohm
I don't use this cable, but I must say I've read excellent reviews about all Canare cables. FWIW, I really like my Canare interconnects on my home stereo system.
Radio Shack (http://www.radioshack.com
42-2682 | Shielded Digital Audio Cable. This is the 12' cable, I have a 3'. Sturdy!!
IDL100 | Comes in various lengths and popular among tapers.
DRA-501 | Double sheild coax, gold-plated RCAs, 1m
DRA-502 | Double sheild coax, gold-plated RCAs, 2m
DRA-503 | Double sheild coax, gold-plated RCAs, 3m
Offers a whole range of cables, standard or custom.
DIGITAL SPLITTERS / BARRELS / ADAPTERS
I'm sure there are others out there, but I haven't seen them mentioned much.
A YM2F-B | 1 male > 2 female RCA
90A | right angle RCA adapter
Y | 1 male > 2 female RCA
YF | 1 male > 2 female RCA (different layout)
DF | F/F RCA barrel
Radio Shack also carries splitters and barrels similar to above.