The big leaguers dealt have been covered ad nauseum, with playoff races in the balance. But what of all those Minor Leaguers? Who were the top prospects sent from buyers to sellers leading up to July 31, and how have they performed since switching teams?
Here's an unofficial ranking of 30 Minor Leaguers settling in with their new organizations. Keep in mind that only true prospects -- ones who still have rookie status -- were considered.
1. Brett Wallace, 1B, Astros: Could the third time be the charm? The thrice-traded, 2008 first-round pick is getting his big league feet wet with Houston, having gone 2-for-9 over his first three games. He should hit for average and some power, and drive in some runs in the Astros lineup.
2. Wilson Ramos, C, Nationals: The Nats feel that they got an everyday catcher of the future for Matt Capps. Ramos has the catch-and-throw skills to play in the bigs right now. In his first three games with Triple-A Syracuse, he's enjoyed the new surroundings, going 4-for-11 with a homer and three RBIs.
3. Dan Hudson, RHP, Diamondbacks: The 2009 MLB.com Minor League Starting Pitcher of the Year got off to a very good start in replacing Edwin Jackson in Arizona's rotation. The right-hander went eight innings and allowed just one run on three hits for his first victory.
4. Anthony Gose, OF, Blue Jays: The toolsy outfielder didn't have to go far. Even though he went from the Phillies to the Astros to the Blue Jays in one day, he simply moved from Clearwater to Dunedin in the Florida State League and went 4-for-13 with a homer and steal in three games.
5. Jonathan Villar, SS, Astros: Villar is kind of like the infield version of Gose -- toolsy, but with a ways to go. The Astros felt that it was time to move him up one rung, so after having spent all year in the Class A South Atlantic League with the Phillies, Villar is now playing in the Class A Advanced California League, where he had a 4-for-4 game in his second game in the organization.
6. Wynn Pelzer, RHP, Orioles: Pelzer took a bit of a step backward this year, and the Padres had returned him to a relief role shortly before sending him to the Orioles for Miguel Tejada. Pelzer has appeared in one game -- also as a reliever -- with Double-A Bowie, allowing one run on two hits while striking out three.
7. Tyler Skaggs, LHP, D-backs: A supplemental first-round pick by the Angels in 2009, Skaggs is reportedly the player to be named in the Dan Haren deal. Because of that, he's kind of in limbo, still officially with the Angels' affiliate in the Midwest League, but he has been kept off the mound since July 23.
8. David Holmberg, LHP, D-backs: The 2009 second-round pick got to stay in the Pioneer League, going from Great Falls to Missoula in coming from the White Sox in the Edwin Jackson deal. The 19-year-old with a good idea of how to pitch has yet to make his organizational debut. He last pitched on July 29, so he should get his chance to show his stuff in the near future.
9. Mark Melancon, RHP, Astros: Many hoped that Melancon would have been a mainstay in the Yankees bullpen in 2010, but it didn't quite work out that way. He still has closer-type stuff, and he made his Astros' system debut in Triple-A on Sunday, throwing 1 2/3 scoreless innnings for Round Rock.
10. Patrick Corbin, LHP, D-backs: The Angels gave up some southpaws to get Haren, and Corbin is a pretty good one. The 2009 second-round pick had earned a promotion to the Class A Advanced California League, and that's where Arizona is keeping him following the trade. Corbin made his system debut on July 30, tossing five shutout innings, allowing two hits and two walks while striking out eight.
11. Lucas May, C, Royals: The solid backstop hit two homers in his first three games with Triple-A Omaha.
12. Andrew Lambo, OF, Pirates: Lambo hasn't developed quite as well as some would have hoped, but he is just 21 and in Double-A.
13. Giovanni Soto, LHP, Indians: The return for Jhonny Peralta, the Midwest League All-Star and 19-year-old won his debut with the Indians, allowing one run on five innings for Lake County.
14. Tim Collins, LHP, Royals: The diminutive (5-foot-7) hurler was traded twice within a couple of weeks, but the guy knows how to get people out (2.25 ERA, .173 opponents' batting average, 87 Ks in 52 innings pitched). The Royals moved him up to Triple-A.
15. Roman Mendez, RHP, Rangers: There's plenty of upside here, though it's far away. Mendez tossed five shutout innings with 8 Ks in his Rangers debut for short-season Spokane.
16. Pedro Ciriaco, SS, Pirates: Ciriaco is kind of like current Pirates shortstop Ronny Cedeno, but with a little more speed.
17. Elisaul Pimentel, RHP, Royals: The 22-year-old was having a solid full-season debut at the time of the trade. He stayed in the Midwest League and gave up two runs over four innings in his Kansas City system debut.
18. Jimmy Paredes, 2B, Astros: A move to the outfield might be in Paredes' future, but he has tools, particularly speed (38 stolen bases in 2010). He's swiped two in his first three games as an Astro.
19. Chris McGuiness, 1B, Rangers: The 2009 draftee is an on-base machine (.416 OBP) with some pop (.504 SLG). The Rangers pushed him up to the Class A Advanced California League, and he went 2-for-5 in his debut.
20. Cory Kluber, RHP, Indians: The Texas League strikeout leader, who comes to Cleveland via the Jake Westbrook-Ryan Ludwick deal, will pitch for Akron in the Double-A Eastern League. Look for a debut soon.
21. Joe Martinez, RHP, Pirates
22. Kyle Smit, RHP, Cubs
23. Daniel Turpen, RHP, Red Sox
24. Brett Wallach, RHP, Cubs
25. Omar Poveda, RHP, Marlins
26. Tanner Roark, RHP, Nationals
27. Ryan Tatusko, RHP, Nationals
28. Evan Reed, RHP, Marlins
29. Joe Testa, LHP, Nationals
30. Nick Greenwood, LHP, Cardinals
Jonathan Mayo is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.