As anyone who has multiple twitter accounts knows you have to have a unique email address for each account.  Well this is of course a pain if you are like me and use gmail for pretty much everything.  There is a work around for this which will allow you to use the same email address for multiple twitter accounts.  It involves using a little know part of the standard used for email addresses.  Basically if you add a plus sign after the first part of your address you can add anything you want after it and it will still go to your account.  Here are some examples.

theman@domain.com

theman+twitteracct1@domain.com

theman+twitteracct2@domain

If you are using gmail or some other email host that supports this portion of the standard all of these emails will go to theman@domain.com.  So in your twitter account settings you can use something like theman+twitter1@domain.com for the first account, then theman+twitter2@domain.com for the second and so on and so forth.  This is also useful for filtering, so instead of giving out your normal address to websites you can give out addresses like theman+spamsite@domain.com and then just create a filter in gmail that will send any emails directly to the trash.

P.S.  Please don’t send email to theman@domain.com because I don’t know who that is.