The XPC form factor PC isn't anything new. Tigerdirect has been selling these for awhile. They even offer a "media center" version with TiVo-like features and a remote.
Despite those features you can't upgrade them very easily(if at all). You're better off building a PC with a [more standard] ATX form factor.
This might be nice if you had it networked with a "real" computer.
EnJoi: Not so sure about the specs you've listed though. The Shuttle system(like your photo) comes with onboard audio and video. No AGP slot for a video card(no space, duh). Here's what Tigerdirect lists:
Processor:
AMD Socket A 462
Athlon XP/Athlon/Duron with 200/266/333MHz FSB
Support AMD XP processors up to 2200+
Support AMD Morgan/Duron processor up to 1.3GHz+
Memory:
2 x 184pin DDR DIMMs (support dual channel DDR)
DDR266/333/400 unbuffer DDR SDRAM (up to 2GB)
Chipset:
nForce2/MCP-T
Expansion Capability:
PCI Slot x 1
USB port x 2
IEEE1394 port x 1
5.25” Reserved Bay x 1
3.5” Reserved Bay x 2
(Two HDs or single floppy + single HD)
Case:
Aluminum chassis 300(L) x 200(W) x 185(H) mm
Front Panel:
Two USB 2.0 ports
One IEEE 1394 port
One Mic-In
One Speaker-Out
Power-On
Reset
One 3.5” bay
One 5.25” bay
Back Panel Ports and Connectors:
One PCI slot panel
One PS/2 Keyboard
One PS/2 Mouse
Two VGA port
One Serial Port
Two 1394 ports
One S-video/Composite connector
Two USB ports
One RJ45 port
One line-in connector
One line-out connector
One Center/Bass connector
Onboard Graphic:
Integrated GeForce2 MX 265-bit 3D VGA
8X mode AGP slot
S-Video Out
Dual Display Support
Audio:
Realtek ALC 650
5.1 Channel Hardware Audio
Support AC-3 Digital SPDIF OutputAudio Driver
Onboard LAN:
Realtek 8201BL
10/100Mb Fast Ethernet LAN Learn More
Support Wake on LAN, Boot to LAN, PXE 2.0
LAN driver
IDE interface:
Two UltraDMA/100 IDE Channels Master from SiS961
80-pin Cable Backward Compatible Legacy ATAPI Devices
ATAPI IDE CD-ROM, CD-R, CD-RW and LS-120 Supports