I’ve generate a few graphs with debtree for the drupal modules (10 Feb 2010).

The list of direct dependencies is not very interesting. Dependencies in drupal are mostly flat or the go one or two level deep… You can still spot redundant dependencies like for the module get-node where then dependency on contents could be left implicit by the virtue that imagefield depends indirectly on it.

The list of reverse dependencies (actually, both direct and reverse dependencies are shown in this graph) are equally not very exciting. Since all dependencies are conjunctive (meaning the all dependencies must be satisfied for a package to work), these graph can give a measure of the importance of a package with respect to other modules in the repository.