I third the vote for more W.C. Fields.
And while we're talking about classic comedians, I don't believe that anyone has mentioned "The Marx Brothers". One of the greatest comedy teams ever and they are represented by 5 films on DVD, all of which are sub-par in picture and sound quality and horribly out of print and rare. I know that WB is planning on releasing many of their titles next year, but what about remastered re-releases of their early movies.
Let's not forget Harold Lloyd either. One of the 3 great silent comedians and there is nothing on DVD. I understand that his family owns the rights and are looking for the right company to distribute them, but let's stop being so picky. These are great films with a small cult audience, so you're not going to find a distributor willing to throw money at them.
Our Gang "The Little Rascals" are also horribly under-represented.
From my understanding, "Laurel & Hardy" & "Abbott & Costello" are also horribly mistreated. I believe that many of the titles by these teams have slipped into the public domain and that we may never see quality releases, which is a terrible shame.