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This is about xterm-256color. It's very much worth it, if you care about colors in your terminal. You will discover more and more subtle differences.

Quite an upgrade if you use emacs -nw.

Unfortunately AFAIK it seems OS X's Terminal.app doesn't support 256 colors.
Yeah, this was an unpleasant surprise for me when I started using a Macbook for some coding. My 256 color vim color scheme (desert256, highly recommended!) would just blink repeatedly until I typed in t_Co=8 ... never thought moving from a Linux machine to a Mac would mean decreasing your colors!
Have you tried using an X11.app terminal instead of Terminal.app terminal? That may have different/better results.
This would be nice, but most terminals only support 8 colors from what I've seen, and 8 colors should be enough for anyone!
Most? I tried non-Linux OSs to see what you're talking about. PuTTY on Windows works perfectly. Yes, Terminal on MacOS X doesn't support 256 colors, but iTerm does.
I started using 256 color terminal a couple of years ago...there are a handful of really nice vim color schemes that take advantage of it. I'm a sucker for nice syntax highlighting, and this change made me happy for days. I found myself wanting to write more code so I could see it in the all it's colorful glory. That feeling has passed, however, so maybe I need to find another color scheme to try.
What color scheme did you use? I find myself loving the dark vim themes.
I think I've settled on desert at the moment. It's dark background, with very mellow highlight colors. Angry fruit salad it is not.
desert eh? I settled down with ir_black. It's pretty light on the eyes. I love it.
This is the first time I learned that "brightblack" exists...

Now I won't be surprised if I see darkwhite and reddishgreen.

xterm-256 is inferior to rxvt-unicode. it supports the color gradients, plus unicode.
Mac OS X's Terminal.app does not support 256 colors. Submit a feature request to Apple if you would wish it did -- I do. Apple Bug Reporter: http://developer.apple.com/BugReporter/
First off, why are you using Terminal.app? :)

I use iTerm mostly because a) tabs! b) I'm a sysadmin and have a ton of bookmarks for ssh connections to various servers (frequent ones with keystroke shortcuts). c) profiles are handy.

iTerm seems to support 256 colors.

Edit: Terminal.app seems to support tabs, must be new in Leopard :)