The first major improvement in Garfield was the removal of Garfield's dialog [1] and the results improved the strip quite a bit, making it more surreal (as well as showing just how disturbed Jon Arbuckle [2] really is).
Now, however, the process has been taken one step further—removing Garfield altogether [3]!
[Jon: Get Back!] [4] [5][Jon: My hand is ever alert] [6] [7][Nothing sadder than a grown man playing with a sock puppet by himself] [8] [9]
I think this makes Garfield not only funnier, but more surreal as the apparent schizophrenia takes hold on Jon Arbuckle.
[2] http://www.tailsteak.com/arbuckle/
[3] http://garfieldminusgarfield.tumblr.com/
[4] /boston/2008/02/26/g-01.gif
[5] http://garfield.com/comics/comics_archives_strip.html?2003-ga031121
[6] /boston/2008/02/26/g-02.gif
[7] http://garfield.com/comics/comics_archives_strip.html?2003-ga031121
[8] /boston/2008/02/26/g-03.gif
[9] http://garfield.com/comics/comics_archives_strip.html?2003-ga031121