Here are some unknown guys who've been hot recently. They're worth checking out and maybee picking up, as most of these guys are probably still free agents.
Shin-See Choo, OF - In his last 10 games he's had 14 RBIs, 6 runs, and is hitting .395. He's really young and still learning, but this is a very nice hot streak.
Mark DeRosa, 2B, OF - In his last 10 games, he's hitting .385, 20 RBIs, 11 runs, and 5 homeruns.
Joe Saunders, SP - He's 4-0 with a 1.67 ERA, with 18 Ks and a whip of 1.04. Hes on the Angels who are making a run at the division, so he'll be a good pickup.
John Maine, SP - In his last 4 games, he's had 3 shutouts and 21 strikeouts.
Chad Billingsley, SP - He had a slow start but has been hot recently. Its not certain if he'll continue to be in the rotation, but as long as he is, he's a good pitcher.