How to generate common blocks?

I have a question regarding the use of the template mechanism.

Say i'm using a common website layout with header, footer and in the
center three columns. Only the center is specific to the request (so
the specific view function will generate the center block), i'm not
sure however what the best way is to generate the common blocks in the
side bars. Lets say i want to have multiple blocks with dynamic
contents (such as a random selected review or frequently searched
items). I guess is can call specific functions to generate the common
blocks but i would have to do so for each view function? This doesn't
make sense to me because quickly blocks will be generated that are not
actually used; would it be possible to do something smart? Like
specifying block-functions inside the template code?

Many thanks for any directions!

Paul

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