TOUCH SCREENS 101
I'm going to try to shed some light as the the good (and bad) of touch screens in an aquarium. I designed all of the Touch Screens for The Living Planet Aquarium and I can give some insight into the thought process that went into them.
Touch Screens vs. Print- the biggest advantage of digital touch screens is the ease in which they can be updated. You can update a master file on your computer and upload it directly into the digital frame (or if it's really fancy, your frames are linked to your server and you upload directly from your computer.) Most aquariums feature species that are fragile, short lived, tasty to their tank mates, hard to replace or all of the above. A printed sign is fine when you have a long lived and easily replaced animal like an anaconda but for most tanks the livestock changes regularly, making replacing printed signs expensive and time consuming. Which leads to another sign problem - animals on display with NO sign or animals on the sign but not on exhibit. Touch screens solve this problem.
ONE VS 100. One touch screen allows you to view as many species as you want to put on the screen. Sometimes there isn't room around a tank for 45 printed signs- which leads to animals without signs or signs being very minimal (picture and name only).
The third advantage of touch screens in an aquarium is that they are back lit which makes them easy to read in a dark exhibit space. You need to be very smart in your placement due to reflections in other tank windows. I actually back lit the printed signs for this very reason.
THE DARK SIDE OF TOUCH SCREENS
Here's the problem, as Snowleopard pointed out- the interference of donor/ sponsorship ads. And that's what they are - ADS. Unfortunately they were an evil I fought and lost. Companies do not sponsor exhibits out of the kindness of their hearts- they want exposure for that $10,000 donation. And subtlety and tact do not figure into their desires. I had one sponsor that demanded that their family be painted into the tank mural and had to be talked out of it with great patience. Often the Board or founders just want/need the money and do not see what the issue is in turning a beautiful gallery into a megamart of corporate logos and signs. It's the bane of the non-profit...
The other huge problem with touch screens has nothing to do with the technology but everything to do with who designed it. Most that I have seen are nothing more than power point presentations created by an intern or secretary. And when they have several hundred to churn out... Well not a lot of thought goes into them. And hiring a real design group to do them would make them beautiful (Monterey Bay Aquarium's are gorgeous) but could cost several hundred thousand... A problem for Non-Profits...
A BRIGHT FUTURE...?
I do believe there is a way to make Touch Screens an important part of aquarium signage- but like any art form, good design, ease of use and restraint of ads make a huge difference between an interactive and informative exhibit sign and a glowing eyesore screaming company logos at you.