Browsers: Back and Forward. I use it all the time without thinking, and I bet you do too.

You really notice it if your browser doesn't cache pages when you go back or go forward. Good browsers make this instantaneous. Chimera reloads - not good.
Also, you have to be able to get to the feature: cmd-left arrow should go back. Chimera doesn't have that yet, but it will, I'm sure.
A great feature that mozilla on my Linux PC has is various options for the scroll-wheel on your mouse: I have it set up so that alt-scroll moves through page history, and shift-scroll changes font size. This is really nice, when I remember to use it.
12:52:17 PM    ...comment? ()

More about browsers:

It took OmniWeb 2 seconds to reload a local copy of that URL below. It displayed some text and links by about 1 second.
Chimera took a little more time, like 2.5 seconds, and displayed nothing until 2 seconds - but that felt faster.

I know I'm more productive in general if I can click through a page before it's fully loaded, but it still feels faster in Chimera...

Of course, for Chimera, I should also count the time it takes to get to that page without the shortcut feature - 35 seconds, assuming I remember that I can start at http://developer.apple.com/techpubs/ and not just developer.apple.com...
12:44:42 PM    ...comment? ()

So I just gave Chimera a try - it does feel faster than either IE (which waits, then loads the page) or OmniWeb, (which loads some of the page, then rearranges it as more data shows up.) and I can't tell which I like better, for now. I will probably end up using Chimera when it's complete, although I might register OmniWeb 4.1 when it goes final, just for the shortcuts:
I have it set up so that when I type "FD NSArray", it loads the Apple documentation on NSArray, which has a nasty long url: http://developer.apple.com/techpubs/macosx/Cocoa/Reference/Foundation/ObjC_classic/Classes/NSArray.html
12:37:48 PM    ...comment? ()