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According to Wikipedia, Aut(P(V)) = PGL(V). Apparently this is proved by using sheaves generated by global sections but I'm not familiar with this notion. I would appreciate it if anyone could provide a reference where this is proved.

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closed as too localized by Charles Siegel, Simon Thomas, Martin Brandenburg, Sándor Kovács, Pete L. Clark Dec 4 '10 at 16:40

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It's in Hartshorne, 7.1.1:… – Ben Webster Dec 4 '10 at 1:58
Ah, thanks! – Adeel Khan Dec 4 '10 at 3:09
The question has been closed: a reference was provided in the comments, which was accepted by the OP. – Pete L. Clark Dec 4 '10 at 16:40