anachronisms?

What devices used in "today's" science fiction will the future people look 
back on and laugh at?


I was listening to some SF thing on the radio last week.  One of the 
characters - in a space ship, between the stars - pulled out a slide rule.
[1]

Any storage media in movies looks a bit odd to me - floppy disks look 
really old, but even standard optical media (which could be some form of 
'super DVD') look old fashioned.  Using a smaller size optical media 
doesn't help either.

Transflash (MicroSD) cards can store a huge amount of information - 4GB? 
8GB? and they're *tiny*.  Smallness isn't great but when I see someone in 
the future pull out a storage mediem the size of a can of soda/pop[2] that

had better store a **huge** amount of data.  Or processing power.  Or
both.


[1] Don't get me wrong, I love slide rules.  But come on, even the people 
who use them think that they're not used very often.

[2] See how neatly I avoid the great soda vs pop debate?