There is an interesting article over at NYTimes.com about the legacy of the Grateful Dead and their different eras and periods. Specifically the underground fandom of amateur tape archivists is discussed at length. One can tell the reporter is a Head which makes the article that much more enjoyable.
Here is the link to the article: http://www.nytimes.com/2009/04/12/arts/music/12ratl.html?ref=arts
There is also a fine fan photo tribute site that is being added to daily: http://www.nytimes.com/interactive/2009/04/10/arts/20090410-grateful-dead-user-photos.html#/0
