Pretty sure you voided your warranty by doing so. I'm mostly sure, not 100%, that if you use unapproved memory you void your warranty with Apple.I upgraded my macbook pro with 4 GB's crucial memory that was built for PC's. It worked just fine.
Like I said about the trackpad, I really like Apples I just prefer the actual FEEL of my Lenovo. I'd LOVE to have the gesture features on my laptop. It really is an awesome thing that those have, but it's not enough to get me to pay the premium for an Apple.
edit- just did a search, you don't void your warranty as long as the memory didn't cause the problems. still probably a good idea to hold on to the ram it came with and replace it if you ever have to take it in for service.
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