loomax,
Support for the /dropins folder is temporarily unavailable due to some technical limitations that we hope to rectify in January with an updated version of Pulse to manage plugins in this manner.
To work around the immediate hickup, here’s a user-created update site for JadClipse:
http://webobjects.mdimension.com/jadclipse/3.3
he clarified that this works for 3.4 here:
http://wiki.objectstyle.org/confluence/display/WOL/mail/3375165
alternatively if you can create a local ZIP or folder structure of an update site, when you go to register the update site you can click the “Local” or “Archive” buttons on the right to add that instead.
Sorry for this seemingly random limitation — it’s a side effect of us integrating a lot of automated update and dependency management into the IDE — it *needs* an update site right now to stream stuff from in proper order. That’s one of the enhancements we are going to get done and out the door fast (supporting /dropins)