o It looks for the NSS database first in the environment variable SSL_DIR,
  then in /etc/pki/nssdb, then it initializes with no database if neither of
  those exist.

o If the NSS PKCS#11 libnspsem.so driver is available then PEM files may be
  loaded, including the ca-bundle. If it is not available then only
  certificates already in the NSS database are used.

o Tries to detect whether a file or nickname is being passed in so the right
  thing is done

o Added a bit of code to make the output more like the OpenSSL module,
  including displaying the certificate information when connecting in
  verbose mode

o Improved handling of certificate errors (expired, untrusted, etc)

The libnsspem.so PKCS#11 module is currently only available in Fedora
8/rawhide. Work will be done soon to upstream it. The NSS module will work
with or without it, all that changes is the source of the certificates and
keys.