I think by now, everyone has heard of the terrible news. Of course, Terry Pratchett's twitter puts it so sadly yet wonderfully.
I love Terry Pratchett's Discworld books, and they have made a huge influence on me. They've been my travel companions many times as well.
To misquote the emperor from Mulan, "You don't find a writer like that every dynasty."
R.I.P. Sir Terry Pratchett