Aptitude tells me there are 179 packages dependent on libgnutls26 - about 20 are installed including: chromium-browser, cups-daemon, libldap, librtmp, libvncserver0, libwireshark3, telepathy (KDE), vlc-nox.

The only thing I really know I use TLS for is email server connections via Thunderbird however.

I think off-hand both Thunderbird and Chromium use NSS for their TLS support.

Yes, they use NSS not GnuTLS.

Are you sure? At least on Debian, GnuTLS is used by CUPS, exim4, cURL/GnuTLS, GnomeVFS, Gtk, NetworkManager, libvncclient, libvncserver, VLC, and wget.

Git and bloody GnuPG are also on that list.

Oh.. well, it seems that Debian uses GnuTLS instead of OpenSSL, I was not aware of that.

In Arch Linux very few packages depends on GnuTlS.

"flashplugin-nonfree Depends libcurl3-gnutls"

I use TLS encrypted connections when fetching and sending e-mail (I use Evolution with a pop mail connection and a roving SMTP for sending).

TLS-encrypted rsyslog tunnels use it. I'm just off to update my central logserver...