"As for useless gadgets? LEDs you can get for your computer case. Unless you're a geek, then its just shiny."
There's one notable exception to this. LED-lit fans are the best. If the fan stops, the lights go out, so you don't lose a lot of valuable equipment to heat damage because you didn't notice that it failed. Also, you can color-code rack units to make them easier to tell which machine is which from both sides.
Clair Seulement wrote:
"Yes! That is true, and now I feel so bad insinuating they are useless. I still wonder why my mom preferred them in her arthritis-free 20s, and why my non-use of them surprises my dad, but you have reminded me to be more appreciative!"
One more thing to consider is that you can use most electric can openers one-handed (these days; I agree with the trouble they caused more than a decade ago).