EXTREME Overclocking has just posted a review on Crucial's Ballistix Tracer PC2-8500 2GB (2x1GB) DDR2 Memory Kit A quote from the article:

DDR2 RAM is currently the mainstream memory of choice for most modern PC systems, it has been around for years and is very reasonably priced. However, with the introduction and fast adoption of DDR3, it is only a matter of time before DDR2 suffers the same fate as all previous memory technologies. While this changeover won't happen overnight, it is unlikely that DDR2 manufacturers will be releasing many more iterations of higher clocked DDR2 modules. With that being said, now is probably the best time to invest in some quality, high-speed, high-capacity DDR2 modules while mainstream production is keeping the prices competitive and quantities available.

>> Crucial Ballistix Tracer PC2-8500 2GB DDR2 Memory Kit Review