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Drupal's core admin/build/block does not scale. Beyond around 15-20 blocks, the list is well over a page long, and it can be hard to work out what blocks should go where. By 50 blocks, the UI has become unuseable.
This module takes a step towards making the admin/build/block page scale nicely for 20-100 blocks, by adding a filter to only display blocks added by any given module specified by the user. This allows the user to at least move the block to the right region, then submit (or reveal all blocks) and then fine-tune the sorting.
(Originally a Github project.)