In reply to davidbeynon:
I guess it's stiff compared to Spain and soft compared to France
Crni Kal, however, is a bit old-school and so are the grades there. Older routes are quite polished, too. Avoid Misja pec unless you climb 7a and harder. Go to Osp instead, you'll find plenty of superb routes in 6a-6c range. If you're looking for easier routes, then Crni Kal is still your safest bet.
About Kotecnik: it's my local crag and as much as I like it, I wouldn't recommend it for one reason and one reason only: it's in the middle of nowhere and there's nothing else to do besides, you know, climbing
Routes are great, though.
Another useful guidebook is "Climbing without frontiers". It covers area around Osp and Trieste as well as the croatian part of Istrian peninsula.