I have been testing free isps for about three monthds. I liked WorldSpy the best but they are dead. FreeWeb sucked but it is gone also. OurHouse.net is OK but for some reason it likes to lock up my system sometimes. NetZero is crap. It is slow to load, unstable, and the banner is annoying.
I have been using Juno for about the last month and I can say that it is the least hassle and by far the fastest free internet service I have used since WorldSpy was bought by them. I don't even notice the ad banner window any more.
Give it a try, hell it's FREE!