It seems mundane, but I am planing on using mine as a thin client. Although, we used big screen TVs as projector/screen replacements in classrooms now. Raspberry may end up there as well.
Graphics performance kinda sucks. Video decoding is accelerated (for AVC and VC1, but not MPEG2), but the X.org 2D graphics driver is a brute-force implementation. Remember, the ARM CPU and GPU is a SoC designed for media devices, not a general purpose Linux or Windows desktop.
I want to try this too on our Citrix cluster but I wish it supported dual monitors.
I wonder if one of those USB adapters that allow you to add extra monitors on to laptops and desktop would work with it? I'm not sure if you can get drivers for other OS's besides Windows and Apple.
I could totally see little Raspberry Pi's behind the scenes on some of those monster Christmas light displays or even to run a wearable lighting display like a light up LED hat or shirt.
The Lilypad and such are made to be wearable. There are DMX and MP3 shields for the bigger Arduinos that would do all of that. It's not necessarily cheaper, but an ARM might be overkill for something like that. (Not that it wouldn't work, of course!)
They are starting to come out with flexible plastic video display screens. Imagine instead of it running LEDs on a shirt or hat, it showing a slideshow of pictures or a video instead on the shirt or hat with the flexible screen attached! Plug in a USB camera & microphone and a USB WiFi unit with a keyboard and screen built into a sleeve and you have a wearable skype and internet unit!
I think it'd be awesome to bundle a camera feed with some live stats pulled from race cars, like steering-wheel angle, gforces, throttle/brake settings, etc.
I am considering (and have read of others of the same mind) using the Raspberry Pi to control my 3D printer. Most likely will still do the graphics prep and g-code generation on a more capable system, but then send the control code off to the Pi for actually driving the printer...
Plug in some USB hard drives and a printer using a USB hub to give it more ports and set up a SABA server and print server and you can have a cheap NAS/Print server box with more control over who can access what. The current cheap little NAS box I have that has 2 USB and 1 LAN port gives me very limited control over the printer authorization and only a limited number of usernames and passwords for Hard drive access. Plug on a cheap USB modem modem that is voice capable and it could also double as an answering machine and fax! For a couple of years after I swapped to Windows XP I used my old Windows 98 machine as an answering/fax machine.
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