What a pain....but at least I'm learning something....I found the JSP cached in...
/opt/zimbra/jetty/work/service/jsp/org/apache/jsp/zimlet/_005fdev/ZIMLETNAME.
I deleted the .jsp and .class files from in there, did a 'zmmailboxdctl restart', and now it works...almost. It queried my LDAP directory (WOOT!!)....but my LDAP filter isn't correct yet so I didn't get any results. Back to the drawing board...
Matt