I think its version 0.5 that's in the repositories. 4pane 0.7 has been out a while now. I find myself using 4pane rather than thunar more and more often. 4pane is harder to learn, but I think its often better at moving files around the hard drive, i.e. after downloading files to /tmp I generally use 4pane to move them to their proper place.
If I recall correctly, 0.7 is not hard to compile but it would be quite nice if it was in the repositories. Main improvement that I see is that 0.7 easily allows for American date format. i.e 3/24/10 rather than 24/3/10.