I make a point of not learning the new framework du jour. (Back in The Day it was the next UI frame Microsoft was putting out.) If I keep hearing about it for

I make a point of not learning the new framework du jour. (Back in The Day it was the next UI frame Microsoft was putting out.) If I keep hearing about it for a few years, I figure it might be worth looking into. I starting writing new sysadmin scripts in Python instead of Perl after I kept hearing about it, for instance. Other than that, I tend to learn on a need-to-know basis. I feel like that has led to little churn in my knowledge. But then, I also try to avoid working in areas that have high churn, which has led to my experience being in areas of low churn.