In reply to GaryK:
Here is the list of climbing areas in Czech, unfortunatly in Czech only, but there is a map which can help you.
http://www.skalnioblasti.cz
Here is the English version of most popular Czech climbing server
http://www.czechclimbing.com/
There is mainly sandstone around Ceska Lipa meaning trad climbing wit slings and knots only. No chalk.
The area called Labske piskovce (more west) is little more sporty and German Saxony just north is traditional and awesome.
E-mail me for any advice or help