I have some old email accounts with Microsoft and Yahoo that I haven't used in years, but maintain so that I have a user name for IM services. Every once in a while though I go to check the email sent to those accounts. Typically there is nothing there and for the last few months there hasn't been anything other than garbage.
I think from this point on I am going to forgo checking any of those superfluous accounts and check my chat logs to see if I even need to keep the usernames to IM people. It seems stupid to have any more than what I am actually using, though I will have to keep the Yahoo account information for Flickr.