Taxonomy Developer Extras is a Drupal module to supply a number of utility features to the Taxonomy module to make development tasks just a little easier.
The initial functions that will be made available will be the creation of vocabularies from a nested array. The idea here is to provide a function that would be used in a modules .install file to easily create a prepopulated vocabulary by calling a single function with a single array as its parameter.
Additional features would be a copy/paste export of a vocabulary that can be added pasted into an update hook.
I suspect that these exist somewhere already but I my google-fu has failed me to date. If anyone knows of it I would love to hear about it.