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<Jun-Dai 00:42, 31 Dec 2004 (UTC)>
From Hippietrail: "should this be marked as archaic or not?"
My vote is no. It still sees use, and some prescriptivist pedants will correct people who use graffiti as a singular noun, offering graffito as the singular form (same as datum/data or medium/media)</Jun-Dai>

I just ran across this in Fromkin et al's "Introduction to Language". They write:

Graffiti means different things to different people. To a lexicographer, it is the plural of graffito; ...