I just upgraded my 13" MacBook Pro (mid-2009) from 2 GB of memory to 8 GB of RAM. What a difference!
I'm wondering what I can/should do with the old sticks.
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Several threads on MacRumors say to keep it for troubleshooting and/or if you need to send it in for warranty service:
Find some more RAM pieces and then make the Byte Light. :)