Gizmos for download:

Blog
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JK_HueShuffle

Seperates hue from luma

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JK_EdgeSpread

Edge Extend

Python snippets I use regularly:

 

Turn off all postage stamps

for node in nuke.allNodes():
    if "postage_stamp" in node.knobs().keys():
        node['postage_stamp'].setValue(0)

Cache all Read nodes locally

for a in nuke.allNodes():
    if a.Class()=='Read':
        a['cached'].setValue(1)
        a['cacheLocal'].setValue(0)

Prints all knobs of the selected node

node = nuke.selectedNode()
for i in range (node.getNumKnobs()):
    print (node.knob(i).name())