Top post is updated through 5/26. Releases in the past week:
5/21: Lakewood released LHP Zach Morris
5/23: Reading released LHP Mario Hollands
5/25: Reading released C Joel Fisher
Also, LHP Tyler Gilbert and SS Arquimedes Gamboa have returned from stints on the DL. 3B Harold Martinez has gone on the DL (sprained finger).
Also - Matt Eddy (Baseball America) reports that Dalier Hinojosa was released on 5/16 - although this one does not show up on the MiLB transactions pages, and the Lehigh Valley roster page still shows Hinojosa (as on the DL).