In Autodesk Flame and Smoke you can use the kiss function to quickly connect nodes. With this script that function is now accessible inside nuke, as well. After it is installed simply select a node and move it to another. When both nodes overlap press the button u and the nodes get connected.
In daily work, this method has has proven for me to be faster than connecting nodes the traditional way using the input or output pipes. With several hundreds or thousands of nodes per day this makes a lot of time savings.
How to install kiss

Download kiss and copy it into your nuke home directory.
In your init.py add this one line:
nuke.pluginAddPath("kiss")

more nformation can be found here:

leafpictures.de/kiss

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