Since I find myself sometimes needing one, I decided to create a fresh, clean, screenshot of a Safari window at 1024×768, with an optional layer showing a 960-wide box, centered. I’ve removed any extras or plugins from the window.
*Update:* Extranaut [Alistair Morton][al] upgraded my version by making all of the text editable in Photoshop. The version for download has been updated accordingly. Thanks, Al!
[al]: https://twitter.com/brundle_fly “Alistair Morton”

[Here’s the PSD (74kb, zipped)][zip].
[zip]: http://extrafuture.s3.amazonaws.com/wordpress/wp-content/uploads/2011/05/Safari-1024×768.psd_1.zip “1024×768 PSD”