Gary, I know DW works with 10.2.8 (I just tried it), but I don't know that it can startup the new G5s---yet.
Labels X still works just fine, Trash X- I dunno, but I have not seen reports of problems with it.
Labels X should not be needed with Panther, but whether that specifically means it will conflict with Panther, again, I dunno.
As I understand it, Unsanity's APE applications will not yet work with Panther.
Harv