I've noticed that Mosaic recently are reissuing Verve and Columbia stuff mostly. I have no problem with that, actually both of them have a great number of stuff that will take Mosaic 100 years to do the reissue.
For Verve:
Complete Kenny Burrell Sessions (can add Argo sessions)
Complete Cal Tjader Sessions (someone mention it)
Complete Jimmy Giuffre Sessions
Complete Lee Konitz Sessions
Complete Kai Winding Sessions (there are not much if his CD we can find, especially on Verve)
Complete Buddy DeFranco Sessions (without Sonny Clark)
Complete Gerry Mulligan (Philips, Limelight, Mercury)
Complete Ahmad Jamal Sessions (on Argo)
....too many
For Columbia:
I don't know too much about Columbia stuff, except those big names (Miles, Brubeck, Duke, Satch...)
But I know there are a great deal of individual recording by some familiar names, and seesions on Mainstream, Epic are also welcome to get the chance to come out.