This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
3. How do I create certificates or certificate requests?
Check out the CA.pl(1) manual page. This provides a simple wrapper round the 'req', 'verify', 'ca' and 'pkcs12' utilities. For finer control check out the manual pages for the individual utilities and the certificate extensions documentation (currently in doc/openssl.txt).