7:30pm: The D'Backs made Diaz an offer, but it appears that he'll sign elsewhere, according to Nick Piecoro of the Arizona Republic (on Twitter).
12:42pm: Matt Diaz seems to be one of baseball's more popular non-tenders. His agent Larry Reynolds believes he'll sign in the "next couple of days, even today." Ken Rosenthal of FOX Sports adds the Diamondbacks to a list of suitors that also includes the Red Sox, Royals, Dodgers, Mariners, Blue Jays, and Yankees. The Phillies and Pirates have come up in a more speculative sense.
Rosenthal notes that the Diamondbacks prefer a first base/left field utility type like Diaz or Xavier Nady to a full-time option like Derrek Lee. It seems they could end up with platoons at third base, first base, and left field in 2011.