Nothing too exciting. There's a few unpopulated 0.100" pitch headers on both the main and audio boards. One of them is probably a JTAG port for debugging on each board, but I haven't checked it out yet.
Basically it breaks down like this:
---CPU board---
CPU: Renesas
6417751R - 240MHz SH4
DRAM: 2x ISSI
IS42S16800A-7T - 8Megx16 70ns (32 Megabytes total)
ROM: Atmel
AT27LV512A - 64kx8 EPROM
FLASH: Samsung
K9F5608U0C - 32Megx8 2.7-3.6V 50ns
MICRO: house label R5F2110 2FP 4200 - unknown 32-pin microcontroller running at 16MHz
(xtal pins 4 and 6)
PHY: Realtek
RTL8139CL - 10/100 ethernet controller
WLAN: Samsung
SWL-2700M - MiniPCI 3B 802.11b/g 54Mbps embedded module
SWITCH: Kendin
KS8995MA - 5 port 10/100 managed switch
---Audio board---
DSP:
TMS320VC5402PGE100 - 100MHz fixed point DSP 32k RAM 8k ROM
Micro: house label 0262F3 D5 4160D - unknown 48 pin micro controller running at 20MHz
(xtal pins 8 and 10)
CODEC: Cirrus Logic
CS42416-CQZ - 6 channel surround codec
AMP: Tripath
TC2000/TK2050 or TK2051 - 50W class T amplifier
OPAMPS: 6x TI
OPA2364 - High CMRR rail-to-rail op-amps