Last draft, we compiled a list of 68 prospects who either worked out, visited, interviewed, etc. with the Pats.
Of the 68, Jarod Mayo, Terrence Wheatley, and Shawn Crable were the only ones drafted. All three were listed as pre-draft visits. IIRC, Wheatley was also listed as a private workout, and Crable was also listed as an All-Star game interview.
Keep in mind however that the list was compiled from various reports that crossed our path. This draft, we're fortunate to have many posters contributing info to the list, leading to frequent updates.