I don't really have too much info on this, but apparently he early this morning (Sri Lanka time). For now, I'll just link his Wikipedia article: http://en.wikipedia.org/wiki/Arthur_C._Clarke
Clarke's science fiction is a huge influence on my writings and setting of Arda, in particular his famous Third Law: "Any sufficiently advanced technology is indistinguishable from magic." I simply apply the reverse.
Condolences, comments, etc...