here are some: funny stuffs, they are sometimes usefull.

Cavaj Java Decompiler - http://www.bysoft.se/sureshot/cavaj
 ( thanks to Herve Minko)

JadClipse, Jad plugin for Eclipse IDE - http://sourceforge.net/projects/jadclipse>

update:
NBJAD - a Jad plugin for Netbeans IDE -

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