Not as in, “Worlds largest cannon”, but as in, “Books included in the official Sci-Fi bible.”
We’ve written before about the lists of top Sci-Fi lists (Top SciFi titles, Geek Reading List, Sci-Fi books recommended by ubergeeks), but this article talks about the list compiled by the Guardian, the British newspaper which has been compiling top books lists for quite a while. The article also goes on to talk about several side lists addressing various special side lists.
All in all, good grist for many future arguments about a difinitive list of Sci-Fi titles.