Wow, I was looking for this.
I have a Guruplug which is my router/storage/pbx and I felt like it's time to add home automation and media streaming to that list.
When I got the unit I turned it on and it immediately started heating up, after 30 minutes of uboot I burned my finger on the usb ports. So I took the 30 day warranty sticker off it and noticed how the power supply is choking the processor leaving absolutely no ventilation room. After some craftsmanship I came up with this:
picasaweb.google.nl teunkloosterman/Guruplug?authkey=Gv1sRgCLalltCt6Z7JxAE (not allowed links on first post
Cost me about € 7 and it has been running eversince. At first I tried it without the fan but it got above 50 degrees C. within minutes, now it has quite a nervous fan in it, almost like the old xbox, but no heat problems what so ever.
I am using e-sata II (2TB 3.5" external PSU), 2,5" 320GB (usb powered, 500mA), 8GB Class6 microSD (mounted on /usr for apps), 2x Gigabit bridged with Wireless WPA2 AES, Bluetooth.
Also, I'm currently running iptables (about 60 rules in 5 tables), squid (transparent port 80), apache (with webmin), asterisk (landline), OpenVPN and SabNZBd+.
The only thing I'm quite disappointed about is the CPU performance on gzip/bzip etc., it drives the CPU wa time to 100%. I tried gzip'ing 50MB, took about 10 minutes or so. Funny thing is that unrar'ing with sabnzbd really doesn't take that much time. I guess the unrar application uses the CPU, while gzip makes use of the cryptographic coprocessor, never really tried.
I also have the 'professional' upgrade kit which consists of a tiny fan between the psu and usb ports, 3/4 of the fan is blocked by plastic, so I didn't use it.
I really urge people to do something like I did!!! DO NOT USE THE ORIGINAL UNIT!
Anyways, I'm glad I found this topic, somebody should link the Guruplug wiki site to: Category:Cores