Which Popup Blocker Do You use?

What popup blocker are people using? Are you happy with it? I haven't had any trouble with those annoying ads except on my Hotmail email account. Sometimes I can't even read my mail because the top half of the screen is blocked. I have no trouble with any other sites, just Hotmail. And here's an interesting browser problem I had the other day and the kids did too, the same day, on their computer which is really weird. When I would type a url into the address bar of my browser, it typed backwards!! Has this happened to anybody? These things tend to happen in waves and when it happens to one it happens to thousands.