The 0.8.1 version of the Acegi Security System for Spring has been released, thanks Ben!

This release fixes a number of non-critical bugs, updates JAR
dependencies to match Spring 1.1.5, and introduces X509
(certificate-based) authentication support.

For Maven users, Acegi Security’s latest JARs are now available from
http://acegisecurity.sourceforge.net/maven/acegisecurity/jars and iBiblio.