<p>I'm a big fan of the Jadclipse plugin and I'd really like to upgrade to Eclipse 3.4 but the plugin currently does not work. Are there any other programs out there that let you use jad to view source of code you navigate to from Eclipse? (Very useful when delving into ambiguous code in stack traces).</p>

I'm successfully using JadClipse with Eclipse 3.4
Eclipse 3.4.0.I20080617-2000
JadClipse 3.3.0
It just works!
EDIT:
Actually, see
OlegSOM's answer
below for the additional steps that you might need to remember to take, if like me you forget to read documentation sometimes!