Tuniq TX-4 Thermal Grease
 

While applying the paste, I encountered two annoyances. The first being the hard-plastic TIM spreader included with the TX-4; being hard plastic, it doesn't flex with the slightest of pressure and thus will often scrape the grease instead of spreading it. The second annoyance was the viscosity of the paste; being so thick, it was extremely hard to apply evenly (especially with the shortcomings of the TIM spreader).

http://www.overclockersclub.com/reviews/tuniqtx4/