Just to reiterate for those of you not familiar with DDR2 - these chips ONLY work on Intel LGA775 Pentium 4/Celeron chipsets. Namely the 915, 925 and the new 955 dual core compatible chipsets. They have a different number of pins than regular DDR and won't even plug into Athlon or older Intel motherboards (such as the 865, 875 or 845 DDR chipsets).
Once again, unless you have one of a very specific set of Intel chipsets (and you'll know it if you do) - don't even think of buying this RAM.
BTW, what up with the reviewer at Newegg that was miffed that the Corsair wasn't a dual channel kit? I've had no problems running simple twin packs in dual channel mode myself, so I've never had a real need for perfectly matched pairs.