I have a dual-boot setup with Mac OS X Mountain Lion and Debian GNU/Linux Sid (fully up-to-date).
gpg in OS X by executing
brew install gpg. I then generated a keypair for myself to use.
gnupg2, although this isn't the default
seahorse packages were installed during the Debian installation.
When I open Seahorse, I get a window with one item that says my name, my email, and "Personal PGP Key". When I double-click on it and get a details view that says "Private PGP Key", the key ID, my email and my name.
Here's my question: when I click the Names and Signatures tab in the key details window, it gives me one item in the list - my key. However, when I click on the key, the button to sign the key is enabled. Is this normal behavior? If it is, what would be the use for signing your own key?