yeah, I've been pondering these same questions. I mean, crucial RAM is pretty much all the same I think. Their PC2100 (what I'm interested in) is all cas 2.5..... then we get Mushkin, who speed sorts every memory chip. So Mushkin Basic is definitely below the standards of their better chips.
This would lead me to believe that with Crucial, you might be getting better quality, while with Mushkin Basic you're definitely only getting chips rated at the lowest quality they consider acceptable. Any other feelings on this matter?