For sources (see also the RPM-README):
  If you are using GNOME >= 2.0, go to "http://savannah.nongnu.org/download/bubblemon/".
  If you are using GNOME <= 1.4, go for version >= 1.2.x.

Binaries for Gnome 1.4 on i386 are available as Debian packages.  If
you are on an RPM based system you'll probably want to read the
RPM-README.

If you are using something other than the above (like any version of
KDE, Windowmaker, FVWM, E or whatnot) and want to do a port (should be
easy if you know some C), please let me (d92-jwa@nada.kth.se) know
:-).