The RedPost/Kit is a DIY Linux powered 19 inch digital picture frame. It features WiFi or USB connection, 128 MB of system memory and a 200MHz CPU. The makers also encourage you to tinker with the system and customise it to your requirements, which is a refreshing change. It’s not as svelte or elegant as other brand name products on the market, but if you’re looking for an open platform to do some clever things with remote transmission of images (like Richard’s SlickerFrame) then this is a cool option (although fiddling with WiFi on a Linux set up is definitely not for the faint hearted methinks). $549.00.
Why is there no physical on/off switch? This is actually a design decision. While on one hand it does feel barbaric, on the other hand, these signs/photo frames are more of an appliance, not a computer. You can hardwire the screen to a light switch…or just unplug it, or put it on a $9 appliance timer. The other reason not to have a switch is security — if a sign is in a public place, no one can just turn it on/off.