I realize this logger is probably below the bar set in a technical forum like AVR freaks, but if you know any teachers looking for a starting point, pass this link along to them. I cobbled together an Uno based data logger for some teacher friends of mine that can be quickly jumpered together with an UNO, a breadboard, and a couple of $1 parts from eBay.
This uses DS3231 RTC alarms & sleeping so that the students can graduate to stand alone builds based on smaller 3.3v boards later. We used this logger in my wife's instrumentation course to introduce all the basic programming concepts with tethered operation before we started the soldered build with them, and I am happy to report that they were all able to build functioning instruments by the end of the course.
I have tried to put in as many education related links in that post as I could find to help instructors, but I would be happy to add others to list if anyone here has suggestions.