RadialDilate is a solution to the fact that Nuke's Dilate node is limited to only a box filter. RadialDilate allows for much more organic image and mask treatments, plus I'm sure there's some other fun uses waiting to be discovered!
You can download RadialDilate here!
You can find Josh Park's RankFilter here!
Find Tony Lyon's dilate & keying wisdom here! (plus much more!)
You can find my Blinkscript guide here!