In reply to Spready:
I've been over there twice for winter climbing, partnered with Slovenians so I was shown around and guide books weren't a problem. Both my trips were at the end of January but I'm aware that conditions can be fickle now, as with most places.
The places that we climbed, and the routes were as good as any of the normal European destinations - but we had good conditions. Had to use skis (hired) for approach after a couple of days of heavy snow.
We climbed at Trenta, Val Mlinarica, Krnica, Prisojnik and Planica Tamar
The only guide I have that cover some of the Slovenian routes is Mario Sertori's Alpine ice. It's a selected climbs book but has about 50 pages on Slovenia.
I thought the grades were tough, they don't give much away!
Enjoy....Jeff