Another security tip, if you're a gmail user.
The following emails are all the same as far as gmail is concerned, but are all different as far as any website or mailing list is concerned.
justincredible@gmail.com
justin.credible@gmail.com
j.u.s.t.i.n.c.r.e.d.i.b.l.e@gmail.com
justincredible+1@gmail.com
justincredible+2@gmail.com
justincredible+farts@gmail.com
Basically, a single gmail address can receive email from essentially an infinite number of different addresses. This is useful for filtering spam and segregating your inbox. Say you want to signup for an email list, add a +whatever at the end to denote where you're signing up. This gives you insight on whether or not they've sold your info, as well, if you start getting random emails to that address.