The Save Icon.
I wonder if, within this decade, the majority of computer users won't recognize the common Save iconography. That small floppy disk icon has evolved from a 5 1/4 (Remember those? They were, in fact, floppy.) to 3 1/2 inchers and zip disks. That Save icon no longer seems to represent modern storage media. Perhaps it should be a USB drive, or a memory card?
Or is the very concept of Save, of writing to a disk, obsolete? My PDA never requires a formal save; it simply saves every change. Web apps 'Save' (update the database field) when you submit your change.