Existing users, 
iGetter: manages downloads, sleeps/shuts down/restarts when finished.
http://www.versiontracker.com/dyn/moreinfo/macosx/11684
Pause: Monitors almost any task, sleeps/shuts down/restarts when task is completed.
http://www.versiontracker.com/dyn/moreinfo/macosx/26158
Pause is really all you need. It is far more powerful than Mac Shutdown X, and freeware. No comparison. If you want something better than Safari's pitiful download manager, then give iGetter a shot. It's shareware, but you can use it for free, just by waiting a few seconds and clicking a widget at the splash screen.
Mac Shutdown X
The best way to shutdown an unattended Mac
Version: 1.4
Better Alternatives
Feedback Type: Commentary
Contributed by: Xeater Friday, December 30 2005 @ 10:59 PM PST
Product Platform: MacOSX
Used Product For: Less than a month
Recommend Product: NO
Comments
Better Alternatives - don40
Pause is great but does not work properly in Leopard. emails to the developer are not answered. Pity ...Wednesday, November 14 2007 @ 03:12 AM PST
Say what, Tension Software? - Felix01
Why am I not surprised a representative from Tension Software would opine that "Mac Shutdown is a lot better?" :-)Now that post has tons of credibility, doesn't it? <much sarcasm>
Saturday, June 06 2009 @ 03:02 PM PDT
Better Alternatives - Tension Software
In my perspective Mac Shutdown is a lot better.I suggest the users to try and see..
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Wednesday, February 21 2007 @ 08:28 AM PST