Today we have released the first (official) version of new WEBO Site SpeedUp. Its general state is beta (release candidate), but all unstable issues are related to UI only. Main core stability is improved (since version 0.6.7) and some new features were added.
Before public 1.0 release we are going to review and improve current user interface (in terms of usability and response times). Also it seems support for punypng optimization will be added to 1.0 (since they have API get up).
Feel free to submit any bugs here, we appreciate your help in improving this awesome software package.
You can also check public demo of WEBO Site SpeedUp.