The following things, listed roughly in order of priority, will show up in future releases.
Writr needs Python and a fairly recent release of PyGTK to run. It also depends on python bindings for GTKHTML2 which currently ship with gnome-python-extras.
Writr is released under the GNU GPL.
Thanks to all the people behind Python, PyGTK, and Python Markdown. Special thanks to the Scribes project from where I took lots of ideas and a bunch of code. Finally, big thanks to Sandino Flores for writing SimpleGladeApp and dozens of PyGTK example programs.