jenkinsci/depgraph-view-plugin — pull request #3 by kohsuke (2012-03-29 21:13:43+00:00)
Title: Changing the direction of the graph

... from top-to-bottom to left-to-right, since:

1) webapps don't normally scroll horizontally
2) job names can be long and so each node tends to be wider than taller.

This visualization works better.