On following link you can slip the 2011 ferry timetable for island Cres and Krk:
Ferry time table for Cres from 01.06.-30.09. and from 01.01. - 31.05. ; 01.10. - 31. 12.
Ferry time table for Krk from 01.06. - 30.09. and from 01.01. - 31.05. ; 01.10. - 31.12.
For all other informations visit:
Jadrolininja