oss4lib

As seen on drupal.org: "This module provides a way to map data in the MARC record to Drupal content types and import sets of MARC records. The module currently supports mapping to the default node fields, taxonomy fields and CCK text fields... By importing a library's MARC records directly in to Drupal as nodes, you can easily recreate your library's catalog in a rich social environment."

Very cool to see something like this pop up into another popular CMS (Scriblio being the prior example).

A copy of the latest release is attached.