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First thing that comes to mind is seperate groups.
Groups allow you to control what a visitor sees based on there-- you guessed it, their group.
The most obvious example of this is the login block which is by default only visible to the anonymous group. The registered users group and webmasters simply don't see it.
You could have a group for each year (2005, 2006, etc) that selectively displays blocks...
Terrion
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