I did the JTC_1_1_M1 tag and build for tomcat-connectors-1.1M1. The main purpose is to be able to use the same connector across all tomcat versions - that was one of the goals of tomcat-connectors. The code is identical with the one in tomcat5.0.2 - except the build procedure and packaging.
I tried it against tomcat-3.3.1a, tomcat4.0.6, tomcat4.1.18 and tomcat4.1.24 - all seem to work fine. Also included in doc/ are basic instructions for setting it up in each of those versions. Tomcat5.0.2 includes it by default, so no special instructions are needed.