Yeah i think you should ask him 1st, or go out and get a part time job to pay for the DSL, At uni in the past i will admit that i have used someones wireless, but only very breifly and while the dude was at work, so he was'nt using it, and therefore i was'nt slowing him down! also if you d/l stuff llegaly etc, it will be your neighbors name that the ISP will hand over to the authorities, not yours and that is a bit unfair.....