Safari vs. Chrome
I'm actually quite pleased. There are some things about Chrome with which I'm not thrilled (e.g., where they put tabs leaves very little title bar to grab onto when you want to reposition the window) but it does seem noticeably peppier than Safari. I've been using it a lot, but I've not yet changed my default browser. Yet.
Now, I don't know if it's actually loading pages faster, or they're doing something that gives the impression that pages are loading faster, but they're doing something. I trust the fine folks in the Safari department down in Cupertino know what Google is doing right with Chrome and will adapt with the next version of Safari (maybe in Lion?).
Oh, and by the way, I'm not impressed with extensions. Most seem redundant. I do use AdBlock and Facebook blocker, tho.
2.8GHz iMac, Mac OS X (10.6.7), also summer '07 MacBook and 2G Touch