[whpalmer4]

With 1.5.1 or earlier on the iPhone/iPod touch, if you mark a folder as dropped on the desktop client, you can hide it from sight (by setting the sidebar filter to Remaining), but it always shows up on the iPhone (and without any indication that it is dropped!) This leads to unnecessary visual clutter on the iPhone if you make use of the ability to drop folders to hide stuff that you want to keep on hand but not see. With the 1.5.2 software, presumably those dropped folders won't appear unless you are displaying All in Projects, and maybe you'll also be able to mark folders as dropped or not dropped from the iPhone as well, which does not currently seem to be possible.

If you don't have any dropped folders in your database, and hearing about them hasn't caused you to think of a bunch of potential uses, you would be within your rights to consider this an uninteresting change :)