The Apache Tomcat team has released 5.5.31. Tomcat 5.5.30 contained a couple of regressions (bug 49647 and bug 49718) which broke JavaMail resources and HTTP 0.9 requests. Both of these issues are fixed in 5.5.31.
In addition, 5.5.31 contains a handful of bug fixes and enhancements. As always, the Tomcat 5.5 change log has the details of all the fixes that went into this release and previous releases.
Tomcat 5.5.31 can be obtained from the Tomcat 5.5.x download page.