We run our sites on Tomcat 4.1 and Java 1.4, and as you can imagine we're falling behind and becoming limited in the libraries we can plug into our apps. We have decided to make the jump straight to TC6 and Java6, but is the current release (6.0.14) considered production ready?
Yes...it's ready. I know many companies who are using it in production, and its also embedded in Apache Geronimo 2.0, which is being used in production at many companies as well. If you are coming from such an older versoin to Tomcat 6, I think you will like what you gain.