I'm really trying to understand what I call the missing domain guessing issue. The last posters are pretty convincing that Verizon is doing the dirty deed & diverting invalid urls to feed their click revenue. But that doesn't fit the facts that I observe and have reported. I have a Powerbook running 10.4.11 and a MacBook running 10.5.1, running side-by-side on my kitchen table, and connected by Airport to a Westell DSL modem connected to Verizon DSL. The network preference panel on each machine shows that it goes to 192.168.1.1 for its router, i.e., the DSL modem. So whatever Verizon is doing, it should affect both laptops the same way. I went to the Westell modem site (192.168.1.1). The connection summary shows a primary DNS of 71.250.0.12, and a secondary DNS of 71.242.0.12. I couldn't change them. In any case, since both computers use the Westell, these DNS can't be reason for the different results. I ran the port and dig commands, but I don't understand enough about them yet. (I wish the man pages were not so lengthy and not so cryptic.) So let me repeat what the issue is. I launched Firefox on each machine. This is a problem, because the version on the Powerbook (Tiger) isn't the current version for Leopard, and when I copied that version over to the MacBook, it upgraded automatically. In any event, when I type "chevrolet", in the MacBook I get the Verizon- Yahoo search program; on the PowerBook, the Chevy website comes right up. I'm not ignoring any postings, I'm not bashing Apple, and I certainly don't want to ignore Verizon. It certainly seems like Verizon is forcing its search program, but that isn't an issue to me if domain guessing is working. All I'm doing is what I've been trained to do and have been practicing all my life. Observe what's going on, and make sure the conclusions fit all the observations. One poster suggested that all browsers now go through iWeb (an Apple program), and - if this is indeed true - could be where changes have occurred. I respectfully request help, but - please - explain why 10.4 still works and 10.5 hasn't from the first day I installed it. (And I'd love to see a tech bulletin that could explain it further.)