The Scheduler module for programming appointments with student has been deeply redrawn and is available for 1.8 and over.
See end of discussion in : http://moodle.org/mod/data/view.php?d=13&rid=328
Still need testing over 1.9 for future release.
Valery - Am I to conclude from your comments that you are volunteering to maintain the 1.8 and 1.9 releases of the Scheduler module? If so, could you create a tracker request under CONTRIB and submit the code there so that I can get it uploaded. Once the new CVS server is available then I can set you up with write access to it but at least it will help provide a common place for getting the latest code, evaluating it, and the ability to use the tracker for reporting bugs. Thanks for your work on the scheduler module - it looks very promising. Peace - Anthony