I archive my stuff to DVD and label them dvd 2010-01, 2010-02, 2010-03 and track the contents of each one in an Excel spreadsheet. Hard disks are prone to failure, backup tapes are prone to failure (not to mention slow when you want to pull something), so I prefer having a physical medium that I think will last a long time. I anticipate switching to Blu-Ray at some point this year, but the spreadsheet organizes my collection in such a way that I can find anything I've archived immediately. It also sets the stage to import it into a database like Access to search on artist name, venue, city, date, and source.
Now if I can just use that process and get through the three large moving boxes of DAT's, DVD's and CD's :-) I am hoping to be through all of my DAT's by the end of the summer.
Josh