nukeevangelist writes:  

a recent article announced a very very interesting addon/module. useful real world application for many communities.

here the story about dead user-Admin module [article] to keep good things in a ever evolving process.

dead user-Admin module [article - out of the real world application-series]

Reclaim that wasted disk space that is taken up by "dead" members!
This module keeps track of how long it has been since a user has last visited. User visits are timed in 30 day increments and automatically restart with each visit. Users that have not logged in for over 90 days are considered dead. You can send a warning mail to individual users or "mass warn" all dead users. Warnings are also timed in the same fashion as the user login.
The warning mail message is easily customized. You can terminate individuals or "mass terminate" all dead users. This is a must-have module for improved site user administration.
Download for free now (no login required)! This version includes all updates and fixes to date."

download here - registration required :: read more on the article Note:
We have been informed that this is NOT a free module and registration is required.