Adrian's Rojak Pot has a review of Mushkin's new high speed, low latency DDR2 memory. The Mushkin 2G XP2-5300 Extreme Performance is able to run with timings of 3-3-3-10, using 2.3v(which is covered by warranty), and keeps cool thanks to Mushkin's unique heat spreader design.
"Of course, all that overclockability is due to the increased voltage that the Mushkin XP2-5300 modules run at. Unlike regular DDR2 modules, these modules are rated to run at a minimum of 2.1V. If you want to seriously overclock it, you need to further increase the voltage to 2.3V or higher."