The latest "stable" MuseScore release is 0.9.5. There are also precompiled
prereleases for some systems and an nightly build for all who want to track
bug fixes etc.
   MuseScore is
still being developed.
 Look at the sourcecode repository..... 
 Nice to hear from you. It has been a while.
 Is there a new release/beta version around or are things mostly svn at this
 point. I would love to play with it some more.
 For the post topic, my comparisons as of now (released versions):
                           complete?    formatting?   usability?
 nted                   almost          good             quite good
                           uses cairo, fast graphics + pango
                           can export to lilypond if preferred, no options
  now. author quite good about fixes, new features...
 mscore              very             lovely,           good, but
  stability/UI too flexible    issues uses qt4, some speed issues for large
  scores? author quite good about fixes, new features but this is a large
  and complex work.
 denemo             claimed         lilypond        wierd, buggy
                           Gtk-GUI feeder for lilypond--if one wants to try
                           lilypond's markup, there is a kate plugin and a
                           python-qt app-frescobaldi.
 noteedit             good             lilypond        hokey, get's job done
                           no longer maintained, KDE3, runs fine on KDE4
                           ignore error messages if you get em
 rosegarden   also does scoring. I found it nearly impossible to use for
  this. It is one of the most complete DAW programs in linux but is now
  dated, stuck with KDE3, could not run on KDE4. Being converted to QT4?
 canorus is the other successor to noteedit. Was very incomplete last
  outing. Anyone heard from them lately?