I'm currently teaching as my second career; I spent 15 years as a programmer/programmer-analyst/systems administrator/consultant.
Many school boards and school administrators are pushing for more use of technology in the classroom without any evaluation of whether it benefits learning. I think that's one problem.
More relevant to the article that started this discussion, I've had serious problems trying to use donated computers in one particular classroom because they were simply too different from each other to support easily. *Any* change in the software was likely to touch off a time-consuming round of fiddling with one or more machines to get it to work the same way as on the others. Teachers do not have copious amounts of time. (I work much longer hours now than I did when I was in IT.) If the poster is going to support the machines once they're in place, that's a plus, but a diverse collection of quirky older hardware might be more of a curse than a useful gift.
Having computers is nice, but if they don't come with support, they'll either draw time from the instructor or collect dust.
If the instructor does get them working and in use, there are a number of potential pitfalls that need to be dealt with. For elementary kids, basic keyboarding skills are an issue. Time spent teaching keyboarding is time not spent teaching something else. (It takes about 20 hours of teaching/practice to get upper elementary kids up to speed on keyboarding. That's a significant chunk of the language arts time for a year.) The extra effort to use an unfamiliar writing device can seriously interfere with a developing writer's progress actually writing. (If the work is simply too hard, the kids *DO* *NOT* *LEARN*. Making tasks harder can shut down progress with the kids who need practice the most.)
I've had trouble with lessons that depended on the kids having certain basic computer knowledge that I found they lacked and had to devote a great deal of effort to playing catch up. (Want to guess the percentage of 8th graders I had who tried to cite "google.com" as the source of an article in the website section of a bibliography? Would you like a long analysis of why it's amazingly difficult to teach teenagers the difference between the location bar and the search bar? (Many of them have used the search bar to input URL's for so long that the habit is thoroughly ingrained and unteaching a wrong idea is much harder than teaching something correctly from the start.)
Sorry, I started to switch topics there. Computers in the classroom can be helpful, but they're not always good and in certain cases they detract from learning. I've seen good lessons that used them, but those took a tremendous amount of preparation and required well-maintained computers. Most classroom computers are under-utilized because there aren't enough techs/admins keeping them usable. Donating admin time is probably more useful to a district or school than donating machines, but your girlfriend might appreciate the machines if you do the work to make them useful.