preview of the Steelers' approach to the NFL Scouting Combine lists a number of names you've read a lot about if you check this storystream regularly. On the offensive line, there's Stanford's David DeCastro and Georgia's Cordy Glenn, though Brown correctly notes that DeCastro is very likely to be gone by the time the Steelers pick.
At inside linebacker, there's Dont'a Hightower of Alabama. The next player down is probably Arizona State's Vontaze Burfict, who Brown doesn't mention, perhaps for good reason -- Burfict might not be worthy of the Steelers' pick at No. 24.
At nose tackle there's Memphis' Dontari Poe and Penn State's Devon Still. Poe has been connected to the Steelers in just about every mock draft ever written, but I hadn't seen Still connected to the Steelers much at all until this week. It seems like a stretch, not only because of the likelihood that Still will be gone before the Steelers pick, but because he might be more of a 4-3 player or a 3-4 defensive end (which the Steelers don't need) than a nose tackle in a 3-4 scheme (which they do).
For more on the NFL Scouting Combine, check out Mocking The Draft.