So I opened up Emacs and started hacking at a pygtk program, because I like Python and I found that GTK looked decent enough I wanted to learn it. Within a few hours, I got a basic version working (0.1) that was just a countdown. A few hours more and I got fisher delays implemented (0.2). (That took around five hours according to the changelog.)
Then I went to debconf8 in Mar del Plata and tried real hard (okay, I didn't try at all) to keep myself from working on the software and follow the conference, and failed, so I polished the interface and implemented more features: a reset handler, control over the initial time (duh!), colors, etc. Now I think it's a pretty decent clock, still lacking some features, but it's been fun anyways.
Now I've got a 1.0 version which seems pretty mature to me anyways. It's been fun.
The chessclock can be downloaded through the Koumbit Redmine site or through git:
git clone git://git.koumbit.net/gameclock.git
The is also a package in Debian and Ubuntu.