Question about memory upgrade...

I have a Macbook right now that addresses only 3 gb of ram (actually I hear it addresses 3.3 gb, but whatever). However, I plan on upgrading to a newer Macbook (or maybe Macbook Pro) in about a year or so.

My question is this: currently, Macbooks and Macbook Pro's use ddr2 667 pc2-5300 ram...will they continue to use this type of ram in about a year's time? I ask this because I'd like to use this memory that I'm buying now in my upcoming notebook. Thanks