Math teachers using computer labs on a scheduled basis, can increase school productivity, by installing computers in their classrooms that can be used by half of the class at one time.
2:1 is useful when using software such as ALEKS, iPass, or Carnegie Tutor on an alternate day basis. If 36 students are in a class, then 18 can be on the computers, while the other 18 receive Direct Instruction.
This can be done very economically. This layout is intentionally messy. No IT involvement was necessary. Just a teacher's willingness to make it happen, and few ethernet switches and power strips.
Please note that no computer lab is needed for the same amount of computer time and small group instruction is facilitated by this approach. It's almost a no-brainer.