I have been following these instructions to install Tomcat, and jsvc on my machine, that has recently been upgraded to Snow Leopard: http://www.malisphoto.com/tips/tomcatonosx.html
After installing Tomcat, it seems to run just fine, and I am able to see the Tomcat landing page when I go to localhost:8080. When I install jsvc, even though it appears to compile properly, it always fails to start. When I check the catalina.out log, it gives the following message:
02/09/2009 16:46:42 30987 jsvc error: Cannot load required shell library /Library/Java/Home/../Libraries/libjvm_compat.dylib
02/09/2009 16:46:42 30986 jsvc error: Service exit with a return value of 1
Looking in my frameworks, it looks like "libjvm_compat.dylib" doesn't exist, but "libjvm.dylib" does exist, though I'm not sure if that's what it should be looking for.