Little tip: I got Netzero free for a month and then I called to cancel the free trial (of the "highspeed" service) and they offered me a year's worth of service for $9.95 a month; I said no thanks, they said, "how about 6.95 a month?" So it's worth calling to cancel.
However I did have some problems with the accelerated Netzero, not loading certain images/pages, and I didn't like the browser bar and interface and such. We're using localnet.com and it's I think $13.95/month for the "express" aka accelerated dialup service. It's very reliable.