I recently found this story over on Overclockers, Bogus TIM paste
I'm rather surprised nobody else has already mentioned it (or at least it doesn't appear so) It appears that there are two lots of TIM paste that were being marketed under false pretenses.
OCZ Ultra II Premium Silver Compound, and CompUSA Silver Thermal Grease. Both claim an extremely high content of microfine silver as the main thermal transfer chemistry. One of Overclockers authors, 'Silversinksam' got suspicious of the two compounds, in part because they 'looked to perfect' and tested them for silver content, and found NO SILVER!
He then sent samples of each, to a professional lab for analysis. The official lab report is part of the article, it concluded that neither compoound contained significant amounts of silver, and that both appeared to be made from the same formulation in the same plant, probably in different lots.
The reaction of the two companies has been most interesting. OCZ immediately did their own tests to confirm the initial reports, and has now switched suppliers (to Arctic Silver) claims to have been defrauded by the original supplier (whom they are pusuing legal action against), and has started a recall of the original formula with a generous set of terms, and freebies to compensate for the problem. They very convincingly appear to be caught in a bad situation, and trying to make the most graceful recovery possible.
CompUSA has done NOTHING as of this date...
Guess who I think deseverves kudos for trying to do the right thing, and who goes into the 'Dubious marketing hall of shame'?