This is super easy to do and will make it easier for everyone responding to your comments via e-mail. I think this is one great way to carry a conversation with someone (which can be hard to do with a blog.)
Go to your DASHBOARD and then to EDIT PROFILE
The first Section is PRIVACY
Click on the box that says SHOW MY E-MAIL ADDRESS
Some of you may have to enter your e-mail.
Now we can all have better conversations! Awesome.