Change authorship in bulk? (On user delete?)

Is there a way (a module) to change authorship status of posts in bulk? Ideally what I'd like is an option when deleting a user to move all of the user's posts to another, arbitrary user (not anonymous). Alternatively, a module that would allow me to say change authorship on all of User X's nodes to User Y.

I have a site that users only create posts for once a year, and user accounts are associated with organizations -- so it could very easily be a different person posting for that organization from one year to the next. I want an easy way to consolidate the nodes for the organization and keep them together under the most recently created account.