>  Unicode encodings? Certainly useful to know. Basic SQL knowledge? Can
> become handy sometimes even in jobs not directly related to databses.
> Knowing what a TLB is and how it works? Exactly where do you need to know
> that? It's not like knowing that would change the way you develop 
> programs.

I think any programmer (that isn't just a code-monkey being told what to do) 
should have a good understanding of the hardware and what it does and 
doesn't do.  Not knowing what a TLB is kind of makes it obvious you don't 
really know about the hardware in much detail.  If you don't know what a TLB 
is, then you probably also don't know much about how the cache or pipelining 
system works.

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