I guess 1.3.19 is already old news by now, but I decided to comment a bit on it, especially on a new support direction that'll start to be adopted in the Pydev development (and I'm still unsure how well that'll work):
Pydev will now try to support Eclipse 3.2, 3.3 and 3.4 (all with the same binaries) -- actually, there are still some known bugs on Eclipse 3.4, but those should be solved for the next release.
Now, while trying to support all those versions with the same binary release, there are some hacks that don't really seem right for me (but I couldn't see another way out for it):
1. Catching Exceptions such as ClassNotFoundException / LinkageError and related and falling back to another version (usually deprecated) of some API
2. When adapting to some interface, instead of having adapter == IElementContentProvider.class, do things as if(adapter.toString().endsWith("org.eclipse.debug.internal.ui.viewers.model.provisional.IElementContentProvider"))
-- because that class still does not exist on a previous version.
3. Using reflection (yes, in languages as Python this would be the default, but Java's not really made for this)
BTW: This wouldn't be possible without using Mercurial locally -- right now I have 4 workspaces, all synched through mercurial -- one for each version of Eclipse and one that's the link to the outside world -- and each of those has some changes to make it compile in that version -- yes, the final code runs in all versions, but it'll only actually compile in 3.3 for now -- the others have classes not defined (which are those cases with ClassNotFoundException), so, the code must be tested later on those versions with the final release.