It might help get wider adoption if the prefixes for theoldnew method weren't Kibi, Mebi, Gibi, etc..
...fixed the typo.
That's personally why I still use gigabyte to refer to 1024 megabytes.
But "Meg" and "Gig" are still correct for file and disk sizes. RAM and other memory, like caches are the only things still measured in binary units.
To be consistent, does OSX 10.6 use "MiB" and "GiB" on memory displays? It would be really dumb if "GB" meant 10^9 for disk/file displays, and 2^30 for memory displays.
Another thing to watch out for is when you compare disk speeds. Some might show MiB/sec (but labeled as MB/sec). ("MiB/sec" has always been wrong - disk manufacturers have been using "MB/sec" since "the dawn of time".)
ps: I usually say "meg" or "gig" in speech too, but write the correct units