The Hitchhikers Guide itself(you mentioned fish but no guide).
It could tell you anything about anything - the modern day equal is of course Google.
Computers! You have to dig deeper, but ever since the original vacuum tube giants, people have imagined more powerful and faster computers - this is the most common (burried) sci-fi gadget out there. FlashGordon etc, all used computers for navigation, flying etc without realy explaining it, they caused us to expect a computer to be able to do well anything, and now they almost can!
Wearable computers - also pretty common in sci-fi and becoming more common in the workplace today.
R2D2 and C3P0! - (butler robots)from (Starwars, I Robot) just check out the Asimo robot.(part of why I own stock in Honda!)
Own your own twiggy!
Jet Packs (pick your multiple sci-fi references (the rocketeer, various superheros etc) There are modern examples of this as well.
Someone already beat me to the jetsons flying car, and there are numerous (unmarketable) real world examples.
DNA manipulation. Island of Dr. Moroe, GATTACA, Frankenstein etc.
We are already curing some genetic diseases, brought to us carried within a common cold virus. Soon we can all be taller smarter and better looking (yeah! :-( )
Air and water recycling systems (name your space movie here, Dune for example). We have similar modern suits, the biodome, and systems on the international space station.
(You mentioned virtual games, but you forgot to nod to Starwars holochess!)