They moved the close tab button onto each individual tab,
i'm using it and aside from the 'glassiness' of the tabs, i'm not seeing much of a difference. I was using a theme on the previous version that placed the close box on each of the tabs, so it's not a change for me. i kind of like having them there. i dig the dropdown option on the right to choose a tab to go to. that helps when you've got a bunch of tabs open from the same site and they're all labeled the same except for the end.
Something i didn't notice until i started responding to this post is it's got a built in spell checker. it's underlining words it thinks i've misspelled with a little red dotted line.
Honestly, this version and the new IE7 are starting to look more and more alike to me.
You look like you're about to do something stupid. I'm in.
I don't believe in a lot of things, but I do believe in duct tape.