Everybody pays attention to the NBA Draft Lottery and even most of the first round. There are many people, however, who do not watch or pay attention to the draft's second round.
Players in the second round, while not as highly touted as their first round counterparts, can sometimes contribute in solid players such as Trevor Ariza, Mo Williams, Marc Gasol, Mehmet Okur, and Luis Scola. There is also an occasional star in the second round such as Michael Redd, Rashard Lewis, Gilbert Arenas (well, former stars), Carlos Boozer, Manu Ginobili, and my personal favorite Monta Ellis.
I'm not promising anything, but these are a few players that I think could contribute right away.