What I've discovered we've needed and wished was done already:
* a network port on either end of the classroom, since they'll find
need for computers somewhere else; you can string CAT5 cable from
that to wherever you want to put the switch/hub, but having to go
all the way around the room is a real pain :). The other benefit
is if your school has a wireless access point set up, you've got
an alternative if for whatever reason the signal isn't able to
push itself into the new classroom.
* dual power points in opposite positions of every wall; we use ~10
laptops with jr & sr infants and have to use long extension cables
to be able to get them all plugged in, but if we had more points
it'd be much easier
* if you can, have a single power point installed in the ceiling
approx 10 feet back from the wall, since ceiling-mounted
projectors are becoming more and more popular (in place of one on
the floor with worries of children touching the hot lens or
tripping over the wires)
Hope this helps,
B
Dalkey School Project NS
an Educate Together school