Here's a list of portable audio recorders with digital input.
Did I miss any?
Flintstone
Under $300 (all discontinued models)
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Creative Nomad Jukebox 3
optical SPDIF
IRiver H120, H140
optical SPDIF
M-Audio Microtrack 2496
electric SPDIF
Sony & Sharp minidisc
optical SPDIF
Sony HiMD minidisc
optical SPDIF
$200 - $500
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Sony MZ-M200 minidisc
optical SPDIF
M-Audio Microtrack II
electric SPDIF
Sony PCM-D50
optical SPDIF
$500 - $1000
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Marantz PMD670
electric SPDIF
Marantz PMD671
electric SPDIF
Tascam HD-P2
electric SPDIF
Edirol R-44
electric SPDIF, 4 channels
Edirol R4
electric SPDIF, 4 channels
$1000 - $2000
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Fostex FR2
electric AES/EBU
Sony PCM-D1
optical SPDIF
Edirol R-4 Pro
electric AES/EBU, 4 channels
Sound Devices 702
electric AES3id
$2000 - $3000
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Sound Devices 722, 702t
electric AES3id
Nagra LB (coming soon)
2 channels
Over $3000
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Sound Devices 744t
4 channels
Sound Devices 788t
8 channels
Nagra VI
4 channels
Sonosax Mini R82
8 channels
Sonosax SX-R4
8 channels
Fostex PD-6, PD-606
6 channels
HHB Portadrive
8 channels
Zaxcom Fusion, Deva 5.8, Deva IV, Deva V
6 or more channels
Aaton Cantar-X, X2
8 channels