A cheap low powered netbook will work well for this. You dont need a lot of cpu power and 2gb ram is plenty. Connect to a usb hub if you need more ports.
Some people are even using Raspberry Pis with FPGA. I would think that they should theoretically be able to handle the ASICs as well: https://bitcointalk.org/index.php?topic=69183.msg919685#msg919685
I think this is my favorite tho.
