In reply to frenchben:
Hi frenchben,
some other information which is not mentioned here by others:
1. Petrohrad is easy to access by public transport. 1h 15min from Prague, then some 30 minutes easy walk to the forest.
2. new 2013 guide is out.
3. really quiet place...especially not on weekends
4. the shapes might seem to be smooth however the rock itself is not. A lot of small, crimpy holds with granite crystals involved
The longest I spent there were 3 days afterwhich my fingers were like a strainer
Once you wanna go I will be happy to give you some other info, maybe to point out some nice sectors...
adam