The GNOME Water Temperature Applet displays water temperatures of rivers, lakes and oceans in your GNOME panel. So you know when you can go swimming. It currently features data sources from Austria, Germany, France, Switzerland, Turkey and the United States. Feel free to suggest more websites with water tempertures or add them yourself.
2009-06-11: Summer update 0.5.1. Data source updates only.
2009-02-10: Version 0.5.0 released: With GUI improvements, Turkish translation and many fixed data sources. Ubuntu Hardy and Intrepid users can get the package from my personal package archive (PPA):
deb http://ppa.launchpad.net/nowic/ubuntu hardy main deb-src http://ppa.launchpad.net/nowic/ubuntu hardy main deb http://ppa.launchpad.net/nowic/ppa/ubuntu intrepid main deb-src http://ppa.launchpad.net/nowic/ppa/ubuntu intrepid main
2008-09-17: Version 0.4.3 released featuring new data sources in Turkey and fixed data sources in France.
The Water Temperature Applet on Debian GNU/Linux Lenny in German. Maybe I won't go swimming today... ;-) The furry background image can be downloaded from the Peach Open Movie Project.
Historic screenshots: version 0.2.0 on Ubuntu 7.04, version 0.3.0 on Ubuntu 7.10