Prague Pissup
Enjoy a stag do in the Czech Republic.
http://www.praguepissup.com/

Prague Weddings
Arranges tailor-made weddings in the city for visitors.
http://www.pragueweddings.com/

Stagweb
A British-based tour operator that organizes stag do's to Prague.
http://www.stagweb.co.uk/Prague.htm