I use www.yahoo.com as well. Doesnt look like many other do though.
Yahoo is kind of weird. Yeah, Google has pretty much blown them away in search, but as a portal, they seem to be pretty popular. One of Leo Laporte's shows was talking about this. Yahoo's entertainment page, OMG!, gets more unique hits than the TMZ page. Their sports page gets more unique hits than either ESPN or CNN/SI, I can't remember which. It's just odd that Yahoo is slumping so badly on search, yet they remain so popular in these other areas.
I cannot stand ANYTHING loading in a new window or tab unless it is a link that opens a new window. I cannot stand other people's web browsers when any webpage loads on opening of a new window.
Oddly enough, most of the time on Firefox, I have new tabs open in a blank page. Only my original page usually pops up to Google.