Googles long-term memory (shezi.posterous.com)

I was shopping for a simple necklace for the femm-bot and found an acceptable one at overstock. For at least the following month, I was positively bombarded with advertisements for that necklace. It was particularly annoying, since I had already bought it.

(I don't actually know which ad network I was being harassed by, it just happens to be the only long-term advertising I recall being exposed to)

It's called behavioural retargeting http://en.wikipedia.org/wiki/Behavioral_retargeting and it's becoming a lot more popular with advertisers. I get it all the time...

Google cannot know if you already bought the RAM, or were still merely considering buying it. So it looks like they assume the latter, just in case.