When I first started on LJ, I decided that I was going to save all of the comment-notification emails. As a backup, I guess. But, really, I don't think I need them. They're not really that important, and, at this point, I trust LJ to back it up. I think I'm going to delete them, thus reducing a small amount of the clutter in my life (and my inbox, in particular).
Do you keep your comment-notification emails? Will my post inspire you to delete your collection?