Email Archive as Life Archive?

After watching Merlin's Tech Talk, I was struck by the shear volume of stuff in my Archive folder. I can't possibly need all of that, right?

Here's a brief rundown of the kinds of things I have in there:

• Payment receipts
• Client communication
• Archived email conversations with friends and family
• Tickler items
• Archived contact emails from various websites I admin
• Registration and user account details for various websites and softwares

Some of this stuff is CYA type stuff that I don't feel like I should get rid of. Some of it is reference stuff to be sure, so I guess that could be moved into Journler or Yojimbo.

Do any of you guys feel compelled like I do to keep an archive of your digital life? Anyone moving this stuff off to a junk drawer app like Journler or Yojimbo? Anyone just deleting with impunity consequences be damned?