We hope that this "beast" will be without a internal fan. Without the Gigabit-Ethernet from the "GuruPlug Plus (Heat)" the device should be cool enough

Take a look at:
http://www.globalscaletechnologies.com/t-guruplugdisplaydetails.aspx#featuresCPU:
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ARMADA™ 168 Applications Processor
Marvell® Sheeva™ Embedded CPU
Multimedia acceleration with WMMX SIMD Engine
800MHz operation (can be extended to 1.066GHz)
L1 Cache: 32KB Instruction + 32KB Data
L2 Cache: 128KB
Hardware 2D Graphics Engine
Memory:
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512MB DDR2-800MHz, 16-bit bus
4Mb SPI NOR FLASH
Up to three micro SD memory card sockets (one internal)
Total of 12MB Flash memory included (4MB external + 8MB internal)
Software:
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u-boot (in internal SPI NOR Flash)
Linux BSP 2.6.29 (in FAT16 partition on external microSD)Debian rootfs (in EXT3 partition on external microSD)
Power:
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Power input: 100-240VAC/50-60Hz 19W
DC Consumption: 5V/3.0A
High efficiency POL DC-DC converters
Interchangeable UK, EURO, & US Adapter
High speed I/O & Peripherals:
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1 x Ethernet 10/100 Mbps
4 x USB 2.0 ports (Host)
1 x USB 2.0 OTG micro-AB port (Device/Host)
1 x MicroSD Socket (w/ 4GB card)
1 x MicroSD Socket w/ JTAG I/F option
1 x Internal MicroSD Socket (w/ 8GB card)
1 x Serial Port over USB (for console)
1 x HDMI Output Port with CEC
RTC w/ Battery