When was the first Sony portable music player released, and when was the first one that supported anything other than Sony's proprietary formats released?
Uhm, 1979 and 1979? http://en.wikipedia.org/wiki/Walkman#Cassette-based_walkman
dirXML is still available, they just call it Identity Manager now.
Top Ten Things Overheard At The ANSI C Draft Committee Meetings: (7) Well, it's an excellent idea, but it would make the compilers too hard to write.