SIPB stands for the Student Information Processing Board. It's a group
at MIT that provides computer related service to the MIT community.
Essentially, it's a group of computer nerds who help out MIT, and in
return have an office and computers to play with.

I first became involved in SIPB in 1991, my freshman year at MIT.  In
1993, I and a couple other SIPB members set up www.mit.edu.  I used to
(and occasionally still do) spend long afternoons in SIPB asking older
members questions, trying new things and in general being a nerd.  I
ended up wasting a lot of time, but I also ended up doing a lot of
cool things.

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events/sipbwebserver
groups/mit