what is actually happening in those "experiments" is that some
of the hydrogen that gets formed due to electrolysis gets "stored"
in the palladium.
"The metal has the uncommon ability to absorb up to 900 times
its own volume of hydrogen at room temperatures. It is thought that
this possibly forms palladium hydride (PdH2) but it is not yet
clear if this is a true chemical compound. When palladium has
absorbed large amounts of hydrogen, it will expand slightly in
size." (stolen from wikipedia. it's well documented though)
now, if you have any knowledge of chemistry you know how
extremely reactive hydrogen is. the excess O2 in the water will at
some point react with it (fish breath youknow).
this accounts for why these "researchers" get such erratic
results. sometimes the palladium they use is saturated, sometimes
it is not.
what these people should do is get some new palladium, be sure
it doesn't contain a buttload of hydrogen already and carry out the
experiment again. this time also account for all the energy they
put in before excess heat is seemingly determined and not just the
input and the output at the time of this new reaction.
some said they found helium and even heavier elements after this
reaction. All I can say is that those were likely found because
people wanted to find them. no other sources (like the CBS news
report) even touched on that.