littleblue, author of FM09SX, the only Mac editor for FM 2009, is working on a version that will be compatible with FM 2010 savegames.
The release date of this promising program is yet unknown, but shouldn't take too long, as littleblue said "Im not far off finishing a prototype for FM10SX... Im in the process of updating the code to be compatible with FM2010 savegames".
Here are some early screenshots of FM10SX as a sneak preview.

Discussion: Mac Editor for FM 2010 in the works
57 comments have been posted so far.
any idea exactly when it´s finished?
Old screenshot was replaced by those 2 new ones.
btw that screenshot is out of date so here's 2 new ones - note the favourites and shortlist features
http://s15.photobucket.com/albums/a395/littleblue50/?action=view¤t=screen1.jpg
http://s15.photobucket.com/albums/a395/littleblue50/?action=view¤t=screen2.jpg