Modifications to key

[Michael Nestler]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi,
I'm new to this list, so if this has been answered before or is obvious,
I apologise.  If someone signs my public key, does this change the key?
i.e. would that render a copy of the public key on my website useless?
What about if I add another User ID?

Thanks,
Michael
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (Darwin)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iEYEARECAAYFAkRMB7YACgkQMY8MHpXUdSlingCfbU7Qu9EmOKUE4rETO32x24kX
pTwAoIRwDk9CXqjk/S+e+e6dMyWh8+2e
=GeID
-----END PGP SIGNATURE-----